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Logitech UE Ultimate Ears Boom 3 Portable Waterproof Bluetooth Speaker - Ultraviolet Purple Pair up to 8 Bluetooth enabled source devices - Connect up to two source devices at the same time. Mobile range of play is up to 45 m (150 ft)., Rechargeable Lithium-Ion Battery for up to 20 hours of battery life** between Micro USB charges., Maximum Sound Level: 90dBA