User's Manual

9
Battery safety.
The battery working environment temperature is 0
℃
to 40
℃
. Please do not use the battery in an
environment exceeding this temperature range.
⑴Improper replacement of the battery is dangerous. If needed, use the battery recommended by
the manufacturer.
(2) The battery charging temperature range is 0
℃
to 45
℃
. Please do not charge the battery outside
this ambient temperature range.
(3)When using battery power in an extremely low temperature environment, you may experience
shortened operating time and incorrect battery level reading. This phenomenon comes from the
chemical characteristics of batteries. The appropriate operating temperature for the battery is 0 °C ~
40 °C
(4) Do not leave the battery pack in storage for more than six months without recharging it.
(5) Recharge the battery pack when it is nearly discharged. When recharging, make sure that the
battery pack is fully charged. Doing so may avoid harm to the battery pack.
Charging safety
When charging the device, please place the device in a normal room. The recommended device charging
environment temperature range is 0℃ to 40℃.
Wi-Fi is secure.
Turn off Wi-Fi features when Wi-Fi is prohibited, such as during an airplane flight.
Care and maintenance.
When wearing headphones, excessive volume can cause hearing loss and even damage to heari
8. Troubleshooting
In most cases, restarting your device will cure any problem. If your device has crashed, hold down the
power button for 8 seconds to hard shutdown. Press it again to turn it back on.
If this does not fix the problem, contact your supplier.
Please have your serial number ready. This can be found on the back of your device.