WATERPROOF IPX7 rated: UE ROLL can be immersed in liquid up to 1m for up to 30 minutes.AUDIO Maximum Sound Level: 85dBA. Frequency Range: 108Hz – 20kHz. Drivers: One 2″ driver and Two Ÿ” tweeters.POWER Rechargeable Lithium-Ion Battery for up to 9 hours of battery life between Micro USB charges. Actual battery life will vary with use, settings and environmental conditions. Charge time: 5.5 hoursWIRELESS CAPABILITIES Pair up to 8 Bluetooth ® enabled devices – Connect up to two source devices at the same time. Wirelessly play (stream) to 2 UE ROLL 2s from one source. Mobile range of play is up to 30m or (100 ft)COMPATIBILITY For Audio Playback – Smartphones, tablets and other devices that support Bluetooth® wireless audio profile [Advanced Audio Distribution Profile (A2DP)] or 3.5 mm audio output.