Size: 6.9*0.9cm 
Battery: CR2477S, 2010mah

Charger : Mirco USB charger
Transmission distance: 30-100 meters
Suitable devices:
iOS: iPhone 4S, iPhone 5, iPhone 5S, iPhone6, iPhone 6 plus, iPad 3, iPad mini, iPad Air
Android: Android 4.3 and above. For example: Samsung Galaxy S3, Glaxy S IV, Galaxy Note II, GalaxyNote III.
Wechat version: version 6.0 and above
Battery life: 1-2 year
Turn on/off:
On, press button for 2 seconds, blue light flash 5 times.
Off, press button for 2 seconds, blue light flash/off.