1. Compatible Devices

Nut and Nut App is available as long as your phone system is Android 4.3 or above, IOS 7.0 or above and supports Bluetooth 4.0. We have tested below devices which can work normally.
Android:
Samsung Galaxy S3 / S4 / S5 / Note3 / Note4
Huawei Mate2 / Mate7 / P7 / Glory 6
LG Nexus4 / Nexus5 / G3
Millet note / millet 3 / millet 4
Lenovo Z2Pro / HTC One M8 /
Meizu Note2
IOS:
iPhone 4s / 5 / 5c / 5s / 6/6 Plus / 6s / 6s Plus
iPod Touch 5 generation
iPad 3 generation / mini / Air and after the new models

2. Fail to turn on Nut

Please try to replace another battery, and long press Nut button, if Nut sounds an alarm and red light flashes, you can enjoy this Nut normally. If still does not work, please contact the seller directly to ask for a replacement.

3. About Battery

Nut F5D, Nut3, Nut3s uses Battery 2032 (each battery can last for about 5 to 8 months), Nut F6 uses Battery 2016 (each battery can last for about 3 months).