Function and operation instructions: Switch/mode conversion: long press to power on or off, short press to convert the playback mode, radio -TFBluetooth, Bluetooth device name 1 688. Volume increase/FM forward station selection/call receiving: press to increase volume when playing music, short press to select radio station in radio mode, and press answer when calling volume reduction/FM reverse station selection/hang up: press to reduce the volume when playing music, short press to select radio station in radio mode, and press to hang up the phone when talking Pause/double audio interconnection: when the two are in Bluetooth mode at the same time, do not connect them to the mobile phone. Press Pause to connect the TWS for any one of them, and then connect the mobile phone. TF memory card jack: Charging jack; Radio antenna: it can be pushed into the host body when it is not radio, and it can be pulled out when it is needed to get better radio effect. In the charging indicator window, the red light is on, and the red light is off when the charging is completed. Specification: 1. output power 5 2.charging voltage 5 volts (1A) 3.battery capacity 1200mA/2600mA 4.intermediate volume playback about 9~24 hours 5.open connection distance about 15 meters Colour: Black Material: ABS Package Contents: 1 x Bicycle Speaker 1 x USB charging cable 1 x Bracket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.