Logitech Ultimate Ears MegaBoom 3 Wireless Bluetooth Sunset Red Speakers – Maximum Sound Level 90dBC, Frequency Range 60Hz – 20kHz, Drivers Two 50mm (2 in), 4 ohm full range drivers and two 55mm x 86mm passive radiators., Wireless Capabilities 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), Compatibility For Audio Playback: Smartphones, tablets and other devices that support Bluetooth and Bluetooth Smart wireless audio profile, Rechargeable Lithium-Ion Battery for up to 20 hours of battery life