Outdoor Portable Bluetooth Speaker Wirele Speakers Loundspeaker Waterproof Heavy Ba Speakers Stereo Subwoofer Music Box 1. To switch music or FM: short pre M 2. Last song/Next song: short pre the volume key0.5 s 3. Turn up/down the volume: Long pre the volume key2 s Note: If you cannot turn off the speakers. Switch to FM mode(Pre M) to close FM radio mode Pre "M" to enter FM mode 1. Pre the power button for the first time to switch FM channel and search automatically, and pre the power button for the second time to cancel the search.It will take several minutes to search the entire space station.After the search, you can pre the volume button to select your favorite channel. 2. To switch channels: short pre the volume key 3. Turn up/down the volume: Long pre the volume key Note: In FM radio mode, Audio cable into the charging port as FM antenna. TWS serial mode 1.Two Speakers of the same model start up at the same time 2. Long pre The M key after power on until the sound is emitted and the speaker is paired. Configuration Bluetooth-compatible version: 5.0 Bluetooth-compatible distance: <33Ft Support: FM, TF card input, U disk input, 3.5mm audio input Extended memory: 32G(Not included) Battery capacity: 1200mAh Charging Time: 2-3 hours Listening/Talking time: 8-10hours Waterproof level: IPX5 Charging parameters: 5V Support music format: MP3, wav, wma, FLAC, APE Frequency response: 100Hz-20KHz Signal to noise ratio: 95dB Distortion rate: <0.5% Material: ABS, mesh Speaker*1 USB Cable*1 Audio Cable*1 User Manual*1