Cooligg Portable Outdoor Sport Waterproof Shockproof Dust-proof Wireless Bluetooth Speaker 4W strong output power with outstanding stereo sound quality and bass effect. Stable triangle shape structure, exquisite and attactive metal grid;Water resistent, Dustproof, Anti-scratch, Shockproof. Charge for less than 3 hours and work for more than 8 hours, suitable for both indoor and outdoor exercise. No More Tangled Wires ! when you go out to enjoy unfettered music anywhere Aux in function support all digital audio device with 3.5mm jack.