Model name:EBS-503 1.Plastic + TPU Rugged 2.Splashproof(IPX6) 3.Built in 1000mAh Li Battery 4.Built-in MIC, with handfree(phone) function 5.With passive radiator, bass enhanced Power source: Rechargeable Li Battery Output power: 5W*2 Wireless: Bluetooth 4.1 Audio Input: Wireless + AUX in Working distance: Up to 20M Working time: Up to 18 hours Speaker unit: 40mm Product size: 158(L)*53(W)*62(H)mm Product weight: 287g