Waterproof:Waterproof and dustproof - IP67 rated: WONDERBOOM can be immersed in liquid up to 1 m for up to 30 minutes. 360 Degree Sound:Maximum sound level: 86 dBC. Frequency range: 80 Hz - 20 kHz. Drivers: two 40 mm active drivers and two 46.1 mm x 65.2 mm passive radiators. Wireless Capabilities:Pair up to 8 Bluetooth enabled source devices. Connect up to two source devices at the same time. Wirelessly play (stream) to 2 WONDERBOOM from one source. Power:Rechargeable lithium-ion battery for up to 10 hours of battery life between micro-USB charges. Charge time: 2.8 hrs.