Gesture EMG Sensor Muscle Signal Control Armband Movement Sensors For Arduino Toys Developers Bracelet with Bluetooth    
used to identify gestures mainly through EMG signals.    
gesture sensor can identify 6 different gestures, with bluetooth BLE module, it supports:    
Ar duino Smart Car, 51 Smart Car, Ar duino Batmobile, STM 32 balance car, Ar duino balance car, 4WD Smart Car, etc.    
colour:black    
Material:Plastic + metal    
size:Inner diameter: 7cm    
Width: 4.7cm    
Package Contents:    
1 * Sensors Controller Armband    
1 * Bluetooth Module    
1 * User Manual    
Only the above package content, other products are not included.    
Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.