The compact yet powerful Zealot S32 max Bluetooth is equipped with a powerful driver with an amplifier for clear sound with booming bass. Dual pairing for a 20W loud stereo sound experience. With a large and high-quality battery with a capacity of 2500 mAh, it can provide a long time of music enjoyment of up to 12 hours (50% volume) when fully charged. Cylindrical design makes it nice and elegant, compact and maximizes portability. Throw it in your backpack and use the strap to hang it where you need it. The S32Max wireless speaker supports 4 playback modes: Bluetooth/USB/TF card (32G MAX)/AUX jack line-in. In USB/TF card mode, the speaker can only read music files in MP3/WAV format. In addition, the speaker will not be able to play music if there are other file format (excel, word, PPT.etc) or folders on your USB/TF card. Do you need to make a call? No problem, the S32 can ensure quality calls with noise-cancelling speakerphone. It is ideal for indoor or outdoor use: gym, office, work, fishing, hiking, yoga, etc.