Function key operation introduction: 1. Switch music or FM: short pre the M key 2. Previous/Next: Short pre the volume key 3. Volume up/down: long pre the volume key To enter FM radio mode: Short pre "M key" to enter FM mode. 1. Short pre the power button for the first time to automatically search, and the radio station will be automatically saved after the search is completed, please wait patiently. A second short pre of the power button can stop the search early. (It will take a few minutes to search all stations. After the search is complete, you can pre the volume buttons to switch to your preferred channel). 2. Switch channel: short pre the volume key 3. Volume up/down: long pre the volume key Note: In FM radio mode, the audio cable will be better when plugged into the charging port as an FM antenna. TWS serial port mode: 1.2 speakers of the same model are turned on at the same time. 2. Immediately after powering on, pre and hold the M key of any speaker until the sound is emitted, which means the pairing of the speakers is completed. Specification 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 Color: Black, Blue, Red, Green, Camouflage What we offer: Speaker*1 USB Cable*1 Audio Cable*1 User Manual*1 Call function, noise canceling microphone makes you answer calls without reaching your phone. Mini is easy to carry. 1200 mAh battery for up to 8~10hours of playtime at 2/3 volume on a full charge. 1.TWS function, you can conncect two speakers with one phone sync 2.Support TWS function, two speakers can be connected in series to connect to mobile phone/computer, the sound is more beautiful and powerful! Support MP3, WMA, WAV, FLAC, APE format music files. 1.IPX5 waterproof, dustproof, shockproof. 2.Mesh cover for protect speaker from water, dust, shock. 1.Bluetooth-compatible 5.0, fast connection and stable signal, compatible with all Bluetooth-compatible devices. 2.Using the latest Bluetooth-compatible 5.0 chip3.Bluetooth-compatible 5.0, effective connection range: 10 meter 1.FM receiver makes you listen to the radio freely.Remarks: In radio mode, please insert an audio cable to increase the radio signal strength, the radio effect will be better You can see the connection of Bluetooth-compatible playing games, will have more feeling!