Mpman BT28 - Manual (Page 5)

Power On
Press and hold Power/Back button to turn on device.
Power off
Press and hold Power/Back button to turn off device.
Page 4
Basic Usage
Note
Memory is checked at time device is turned on. Booting time might change according to memory availability.
Note
Be aware that data can be permanently lost if not previously saved at time of forced reset.
Forced Rebooting
Press Reset if device is not responding or malfunctioning to reboot it.