IPX7 rated: Ultimate Ears BOOM 2 can be immersed in water up to 1m for up to 30 minutes.
Rechargeable Lithium-Ion Battery for up to 15 hours of battery life between Micro USB charges. Actual battery life will vary with use, settings and environmental conditions. Charge time: 2.5 hours
Maximum Sound Level: 90dBC Frequency Range: 90Hz - 20kHz Drivers: two 45mm (1 3/4") active drivers and two 45mm x 80mm (1 3/4" x 3") passive radiators.
Pair up to 8 Bluetooth enabled devices - Connect up to two source devices at the same time. Wirelessly play (stream) to two BOOM 2s from one source. Mobile range of play is up to 33m (100 ft). NFC (passive) enabled - (works with active NFC enabled source devices * Android Jellybean and higher).