mellow 5W Portable Wireless Bluetooth Speaker - Black

Power button: long press to turn on and off, short press to pause/play
- button: when playing music, short press to switch to the previous song, long press to reduce the volume
+ button: when playing music, short press to switch to the next song, long press to increase the volume
M button:
In FM mode: single click the power button to automatically search for radio stations, single click +/- to switch stations, long press +/- to increase and decrease the volume
In Bluetooth mode TWS fucntion: long press the M button