1. Material: ABS
2. Power supply: 2000mAh rechargeable lithium battery
3. Sampling time: 1.5 seconds
4. Detection temperature: -10 degrees Celsius to 50 degrees Celsius
5. Relative humidity: 20 to 85 percent
6. Storage temperature: -10 degrees Celsius to 60 degrees Celsius
7. Detection method: sensor laser
8. Measurement: PM2.5 HCHO TVOC Temp Hum
9. PM2.5 0-999: micrograms/cubic meter
10. HCHO Range: 0.001-1.999 mg/m3
11. TVOC Range: 0.001-9,999mg/m3
12. Product size: 90x90x50mm
13. Weight: about 320 grams
Packing list:
- Detector x 1
- USB charging cable x 1
- English manual x 1

1. Brand new and high quality.
2. XLR connector with internal strain relief for rugged reliability.
3. The line is smooth, bending is good, even in the case of extreme distortion to maintain high signal fidelity.
4. This cable is designed to connect a stereo microphone with a single XLR output to a stereo mini phone input.
5. It is ideal for connecting a shotgun microphone to a DV camera.
6. Oxygen-free copper (OFC) conductor for improved signal clarity.
7. OFC spiral shield for effective EMI and RFI rejection and flexibility.

1. It has excellent mechanical strength and high quality electrical insulation
2. Used in factories, miners, schools, homes and electrical maintenance
3. Especially suitable for electrical teaching courses and radio experiments
4. DC voltage range: 0-10-50-250-1000V
5. AC voltage range: 0-10-50-250-1000V
6. DC current range: 0-0.5-50-500mA
7. Omega: x10, x100, x1K
8. Decibel: AC voltage range is -20dB to +22dB
9. Power supply: 1 AA battery (not included)
10. Size(Length x Width x Height): 8.8 x 6.0 x 2.5cm / 3.5 x 2.4 x 1.0inch
11. Package Contents:
- 1 X MF-110A AC/DC Analog Multimeter (battery excluded)
- 2 test pens

1. Material: Acrylic + Aluminum + Stainless Steel
2. Main color: black
3. Power: 3000mW
4. Laser wavelength: 405nm
5. Image format: jpg bmp
6. Image size: 490*490 pixels / 0.075mm distance
7. Image engraving pattern: bitmap engraving
8. Support system: Win7 / Win8 / XP / Win10
9. Supply voltage: 5V.
10. Supply current: 500mA
11. Item Size: 16 x 14.5 x 19cm
12. Item weight: 976g
13. Package size: 30*21*23cm
14. Package weight: 1800g

1. Material: Anodized aluminum
2. Air Flow: 80-170 CFM (cubic feet per minute)
3. Noise: 45 dB
4. Thermodynamic stove fans are designed to circulate hot air produced by wood/coal or pellet stoves with a normal surface temperature between 70 degrees centigrade and 345 degrees centigrade
5. The thermoelectric module acts as a small generator to drive the fan motor and does not require batteries or electricity
6. Better circulation of warm air for greater comfort and 28% less wood for the stove
7. The oven stand is treated with anodized aluminum, which will not deform and discolor even if it works for a long time at high temperature
8. Product height: 21cm
9. Product width: 13cm
10. Product length: 16cm
11. Weight: about 670 grams

• 3D glasses type: Red and blue
• Visual Experience: Non-immersive
• Type: Binocular
• All-in-one virtual reality glasses: Yes
• Model Number: Digital Camera Sunglasses
• Set Type: Glasses Only
• Gesture recognition: No

1. Compatible with some BaoFeng handheld radios, some TYT handheld radios and some Yaesu handheld radios
2. Connector type: SMA-F (female).
3. This item is suitable for short distance communication.
4. It is simple, economical and convenient.
5. Antenna length: 108.5cm

This specific grape wine refractometer is used to measure the sugar content of grape juice (see Brix scale on the left) in the brewing process. Then, according to the sugar content of grape juice, we can understand the alcohol concentration of grape wine after brewing.
It can measure both the sugar content of grape juice and the alcohol concentration of grape wine.
It cannot be used to test the alcohol concentration of finished grape wine.
It features automatic temperature compensation (ATC), so the fractometer is automatically adjusted to correct for temperature discrepancies in ambient temperature.
Double scale design to measure the sugar content of grape juice (0~40%) and the alcohol concentration of grape wine (0~25%).
User-friendly design, sturdy, compact size and light in weight, convenient to hold and carry arround.
We provide manual in English, Russian.
With built-in ATC (automatic temperature compensation) from 10~30 degrees Celsius.
Soft rubber eye for comfortable viewing
Equipped with scale measurement that provides direct reading
Accurate test results guaranteed
Durable and Belit to last a long time
Adjustable manual focus
Use only ambient light which means no battery or power source is required

一. Technical parameters:
1. Working voltage: DC12V (3V/6V/9V/24V customizable)
2. Static working current: ≤10mA
3. Working temperature: -40 degrees Celsius - +80 degrees Celsius
4. Receiving sensitivity: greater than or equal to -95dB
5. Working frequency: commonly used 315MHZ, 433.92MHZ (others can be customized)
6. Output current: less than or equal to 10A
7. Working mode: inching, self-locking, interlock, delay (adjustable)
8. Output mode: contact output (can control AC and DC)
二. Scope of application:
This product is controlled by intelligent microprocessor and can be applied to garage door control, lighting control, remote control curtains, access control systems and various motor control systems, etc. Small size, easy installation, safe and reliable use and so on.
三. Product Features:
1. Output relay switching value: It can control loads with different voltages less than 250V. The power supply must be 12V.
2. Small size: Small size, the size of the circuit board is only 35x30x17mm.
3. The working mode can be adjusted by the user at will: the working mode of self-locking, interlocking, inching and delay can be adjusted by pin short circuit.
4. Code pairing learning: You can learn to pair with the same frequency remote control at will (don't worry if you lose the remote control during use, just buy one remote control and learn it, and you don't need to replace the whole set, which greatly saves user costs).
四. Find out how to use the code:
1. Jog learning method:
Press the pairing button on the control board once and the LED light will flash once, then press the button on the remote control that needs to be paired, and the LED light on the control board will flash several times continuously, indicating that the code pairing is successful.
2. Self-locking learning method:
Press the pairing button on the control board twice in a row, the LED indicator will flash twice, wait until the LED indicator turns off, then press the button on the remote control that needs to be paired, the LED indicator will turn on, the control board will flash several times continuously, indicating that the code pairing is successful.
3. Interlocking learning method:
Press the code binding button on the control board 3 times continuously, and the LED indicator will flash 3 times. After the LED indicator is off, press the A button and B button on the remote control that needs to be coded, and the LED indicator on the control board will flash several times continuously. It indicates that the code binding is successful.
4. 5-second delay learning method:
Press the code pairing button on the control board 4 times in a row and the LED light will flash 4 times. After the LED light goes out, press the button on the remote control that needs to be coded. .
5. Delay learning method by 10 seconds:
Press the code binding button on the control board 5 times continuously, and the LED indicator will flash 5 times. After the LED indicator turns off, press the button on the remote control that needs to be coded. The LED indicator on the control board will flash several times continuously, indicating that the code is successful.
6. 15-second delayed learning method:
Press the code pairing button on the control board 6 times continuously, and the LED light will flash 6 times. After the LED light goes out, press the button on the remote control that needs to be coded. The LED light on the control board will flash several times continuously, indicating that the code pairing is successful.
五. Precautions:
1. Do not operate with the power on. The power must be turned off for operation, and the power must be used after the test is confirmed to be correct.
2. When the voltage of the remote control is low, replace the battery in time (when the battery voltage of the remote control is low, the remote control distance generally becomes shortened).
3. When using wireless electronic products, care should be taken to avoid metal masks, large electronic equipment, electromagnetic fields and other strong sources of interference, so as to avoid the short distance between the remote control and the receiver, or it will not work properly.
4. Do not use this electronic product abnormally. Abnormal use will reduce the performance and life of the product, and in severe cases, damage the product and bring hidden dangers to your safety.
5. The delay time setting is set automatically when entering learning mode. The delay time setting is associated with the number of times the learning key is pressed. Please pay special attention.

1. Product: SG90 Servo
2. Torque: 2.0kg/cm(4.8V), 2.2kg/cm(6V)
3. Speed: 0.09s/60°(4.8V), 0.08s/60°(6V)
4. Rotation angle: 180°
5. Operating voltage: 4.8~6V.
6. Gear: plastic
7. Deadband: 7us
8. Weight: 10.5 g
9. Size: 22.8mm × 12.2mm × 28.5mm

1. The measurement accuracy reaches SO4064 Level B
2. The meter is vacuum treated and isolated from outside air and measured water, so it is not easy to take off the meter
3. Under the condition of ensuring performance, increasing the water inlet and outlet holes of the impeller box can effectively reduce the pressure loss of the water meter
4. All-copper anti-rust joint with leak-proof sealing ring
5. Wing rotation structure: rotary wing type
6. Pressure rating: less than or equal to 1.0mpa / 1.6MPA
7. Installation method: horizontal installation
8. Product size: 11.5x7.5x8.5cm
9. Product weight: 611g

Product information
1. The LINEPAUDIO telephone preamplifier adds phonograph functionality to any amplifier or receiver with an auxiliary standby level input.
2. Prephonograph signal amplifier with AUX input and volume control and AUX has no signal amplification function.
3. The Phono Preamplifier adds a phonograph function to any amplifier or receiver with AUX/CD/DVD audio line level input in standby.
4. It can also be used to drive the record directly into a mixer or computer sound card. With its precise RIAA balance and 80dB S/N ratio, the product can also be used to directly insert the turntable into the mixer or computer sound system. In order to switch the auxiliary input to replace the use of stereo or computer, eliminating the need to plug and unplug the source signal, as well as the product sharing connection. The sound quality of the preamplifier is easy to match or exceed the sound quality of the phonograph preamplifier built into a high-quality stereo component.
5. The product configuration switch function selects the AUX input instead of the occupied stereo or AUX input port on the computer. There is no need to connect or disconnect a shared input signal source of the product.
6. The output level control is very convenient to use the sound card and allows the elimination of the largest signal difference between the switched signal sources.

Characteristics
1. High quality RIAA phonograph preamplifier, for use with dynamic magnetic type jukeboxes.
2. Accurate and stable integrated circuit design.
3. Gold-plated headphone input and RCA output connection port, reliable performance.
4. Stylish and sturdy metal case to increase resistance to electrical noise.
5. Output level control allows you to adjust the volume to provide signals from other sources.
6. Distortion ratio: 0.06% (max).
7. Frequency response is: +/-0.5dB, 20Hz - 20kHz.
8. Phonograph input impedance: Phono: 47K ohms - 200pF nominal.
9. Line input impedance: AUXL: 10K ohm.
10. Output impedance: 200 ohms.
11. Channel separation: 50 dB.
12. Voice: 40dB arbitrary signal source (Phono).
13. Phono sensitivity: 3.3MV.
14. Output: 300MV.
15. SNR: 85 dB.
16. Power supply: DC 12V 1A.

1. Size: 38mm(length) x 22mm(width) x 14mm(height).
2. Weight: 8 g
3. Working voltage: 3.3-5.5V.
4. Clock chip: DS3231 high precision clock chip
5. Clock accuracy: within 0-40 degrees C, accuracy 2ppm, annual error of about 1 minute
6. With 2 calendar alarms
7. Programmable square wave output
8. The real time clock generates seconds, minutes, hours, week, date, month and year and provides leap year compensation valid for up to 2100 years
9. The temperature sensor inside the chip is accurate to +/- 3 degrees C
10. Memory chip: AT24C32 (32K memory capacity)
11. IIC bus interface, high transmission speed 400KHz (when working voltage is 5V)
12. Can cascade other IIC devices, 24C32 address can be changed by short circuit A0/A1/A2, default address is 0x57
13. With LIR2032 rechargeable battery to ensure the watch works normally even after the system is turned off
14. Packaging: Anti-static single packaging
15. Wiring instructions (taking Arduino uno r3 as an example):
SCL - A5
SDA - A4
VCC - 5V
GND - GND
16. DS3231 is a high-precision, low-cost I2C real-time clock (RTC) with integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device contains a battery input, which can maintain accurate timing when the main power is disconnected. The integrated crystal oscillator improves the long-term accuracy of the device and reduces the number of components in the production line. The DS3231 offers commercial and industrial temperature ranges and is available in a 16-pin 300mil SO package.
17. RTC saves information of seconds, minutes, hours, day, date, month and year. Months less than 31 days will automatically adjust the end of the month, including corrections for leap years. The clock working format can be 24-hour or 12-hour with / AM / PM indication. It provides two configurable calendar alarms and a configurable square wave output. The address and data are transferred serially via the bidirectional I2C bus.
Sophisticated temperature-compensated voltage reference and comparator circuits are used to monitor VCC status, detect power failures, provide reset outputs, and automatically switch to backup power when needed. Additionally, the monitor/RST pin can be used as a manual input to generate a μP reset.
18. In addition to high timing accuracy, the DS3231 also has other functions that expand the additional functions and selection range of the system host. The device integrates a highly accurate digital temperature sensor, which can be accessed via the I2C * interface (just like the clock). The accuracy of this temperature sensor is +/- 3 degrees C. The on-chip control circuit can realize automatic power detection and manage power switching between the main power supply and the backup power supply (i.e., low battery voltage). If the main power supply is turned off, the device can continue to provide accurate timing and temperature without affecting performance. When the main power is turned on again or the voltage value returns to the allowable range, the on-chip reset function can be used to restart the system microprocessor.

1. Control 433MHz RF remote control to mobile phone APP control via WiFi, allowing you to control 433MHz RF device APP, and the second to become a smart home.
2.Support adding four 433MHz RF remote controls/RF curtain switch/RF alarm
Support up to 16 433MHz RF devices, support timing/timekeeping tasks, and can be turned on/off at specified times. Management is more convenient.
3.The master account can share the device to others, which is easy to use and quick to add.