Ultimate Ears WONDERBOOM Waterproof Super Portable Bluetooth Speaker – IPX7 Waterproof – 10-hour Battery Life – Deep Blue

WATERPROOF IPX7 rated: WONDERBOOM can be immersed in liquid up to 1 m for up to 30 minutes. 360° 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 POWER: Rechargeable lithium-ion battery for up to 10 hours of battery life between micro-USB charges. Charge time: 2. 8 hrs WIRELESS CAPABILITIES: Pair up to 8 Bluetooth enabled source devices. Connect up to two source devices at the same time.