Speaker size: 196*68*68mm Packing size: 210*74*80mm Bluetooth version: 3.0 Bluetooth distance: 10M Battery capacity: 800mAh Frequency response: 80Hz-18KHz Output power: 3W+3W Distortion: less than 1% Speaker size: 45mm Input voltage: DC 5V Power switch: toggle power on/off Mode switching: short press the M key Track switching: short press +/- button Volume adjustment: long press +/- button Play/Pause: Short press play/pause button Answer/Hang Up: Short press the call button How to use the radio Press the M key to switch to the radio mode, press the play button, the speaker enters the automatic search state, the search is completed automatically, press the +/- button to switch the radio. Note: When using the radio, plug in the USB cable to act as the receiving antenna. Serial mode connection method 1: Turn on both speakers at the same time, press and hold one of the "M" buttons, the speaker will sound a tone, which means the speaker group is successful. 2: Turn on the Bluetooth function of the mobile phone, search for the Bluetooth device, find F15, and click Connect. Note: The serial mode is only applicable to the Bluetooth music mode, and the card/audio/radio/call mode is automatically disconnected.