This is the Grove - Gesture from SeeedStudio. This little device uses the PAJ7620U2 sensor to integrate gesture recognition with general I2C interfaces and to combine all of this into one single chip. In total, it can recognise 9 gestures including left movement, right movement, up and down and many more with a simple swipe of the hand. Below is a demonstrative video showing the basic function of this clever device and the applications of this sensor are widespread. You can use this to adjust the sound volume of a device, control a robot or you can even make a remote-controlled unit that is able to operate several devices simultaneously. [youtube ] Features: 9 gesture recognition Built-in proximity detection Various main boards support : Arduino UNO/Seeeduino/Arduino Mega2560 Part list: 1 x PCBA-Grove - Gesture; 1 x 26AWG Grove Cable (SA206120099A). Specifications: Interface: IIC 13 gesture recognition Operating Power: 5V Dimensions: 20 x 20mm Sensor: PAJ7620U2 Detecting range: 5 - 15cm Ambient light immunity: < 100k Lux Gesture speed mode: Normal and Gaming Documents: Please visit the wiki page for more info about this product. It is always appreciated if you can help us improve the documents by adding more demo code or tutorials. For technical support, please post your questions to the forum .