Built-in charge plug, push out the wristband, put the unit into a USB port and get it full power will standby 7 days or more.
Wearable maximum length is 7.6 inches, wearable minimum length is 5.5 inches, the widest point length is 0.7 inches.
Compatibility: requires Android 4.4 or above, iOS 7.0 or above, Bluetooth 4.0 or above. download APP "Zeroner" from Apple Store or Google Play for free.
TPU material waterproof IP65, not afraid of washing hands/ doing housework/ walking under rain.
Manufacturer Contact Information: firstname.lastname@example.org Any problem contact us any time.