Bluetooth Compliance Bluetooth 3.0+ EDROperation distance ��10MOperation frequency 2.4G-2.48GHZImpedance 4��Output Power 3W Audio Signal -Noise Ratio >75dB USB Charging Voltage DC 5VWorking Voltage 3.7VBattery capacity Rechargeable 400mAh ithium-ion batteryWorking Time 4-5 hours on medium volume Audio Input Bluetooth&Line-inCharge time 1.5-2 hoursMaterial Acrylic+ABSPackage40 pcs/carton; Carton size: 49 x 39 x 20.5cmProduct Size 75*75*57 mmN.W/G.W145g/265gProduction Features *Adopt wireless bluetooth connection and support those product that have bluetooth functions， such as mobile， tablet PC and laptop.*Support line-IN audio input.*Hands-free multifunction speaker is specially design for safety driving.*With voice promt function， and it can mostly connect with two phones at the same time.