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 ABSAvailable color white/black/gold/silver/red.Package Carton size: 49 x 39 x 20.5cmProduct Size 75*75*57 mmProduction 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.*Different colors for choice， mixed color order welcome