CUSTOMIZABLE EQ Select the best Sound for different occasions with 4 different presets and a customized tuner. POWER Rechargeable Lithium-Ion Battery for up to 20 hours of battery life** between Micro USB charges. AUDIO 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).