Bluetooth Compliance Bluetooth 3.0+ EDROperation distance ��10MOperation frequency 60HZ-20KHZImpedance 4��Output Power 3W Audio Signal -Noise Ratio >65dB USB Charging Voltage DC 5VWorking Voltage 3.7VBattery capacity Rechargeable 1000mAh ithium-ion batteryWorking Time 8-9 hours on medium volume Audio Input Bluetooth&Line-inReceiving Sensitivity (TYP) -90dBm Material AluminiumPackage40 pcs/carton; Carton size: 49 x 39 x 20.5cmProduct Size 75*75*57 mmN.W/G.W145g/265gProduct Features *Wireless Aluminum alloy Bluetooth speaker with stand function， convenient to watch movies and play game*3.5mm Auxiliary input to connect external non-bluetooth audio devices such as MP3， Computer， Notebook， PSP etc.*Professional stereo sound design with 1000mAh output power & double horns*Humanized design of card slot， suitable for smartphones and tablets， especial for iPad*Simple and fashionable appearance， exquisite workmanship， metal texture， unique style shows personality.*Upgrade function can used as 2200， 4400mAh， 5500 mAh power bank.*Different colors for choice， mixed color order welcome*Customized logo or design is highly welcomed