BEASON IPX4 Waterproof Portable Bluetooth Speaker with deep Bass & 15 Hours Playtime Hi-Fi SOUND & MOVING PARTIES -- Extra loud with amazing high definition stereo sound. Our subwoofer design provides excellent Hi-Fi audio & enhanced bass with BAS technology, perfect for home, kitchen, living room, bathroom, car, beach, party. OUTDOOR & SPORTS FAN -- Our speaker is IPX4 rated waterproof, shockproof and dustproof. ULTRA portable at 2.7 x 2.4 x 4.4 inches(L x W x H), much better for biking, hiking, camping and outdoor activities. MULTI-FUNCTION SPEAKER -- 4 Working modes include Bluetooth/ TF card / FM/ AUX make a multiple function speaker. Please make sure connect the aux port in correct way, more detail information is included in manual. BLUETOOTH 4.0 -- Never drop a beat with latest Bluetooth 4.0 technology. Bluetooth 4.0 consumes less power and has improved connection strength, while maintaining backward compatible with older devices. 15 HOURS PLAYTIME -- 2500mAh battery for up to 15 hours long playtime at medium volume, enjoy non-stop music without frequent charging. Please read the instruction before using our speakers.