Special featuresMultifunctional Bluetooth speakersSpeaker easy to link with Bluetooth player mobile phone PDA Tablet PC and laptopSpeaker support micro SD card supports MP33.5mm stereo line-in cable (included) for playing other audio devicesEasily paired with Bluetooth-enabled devices easy to enjoy musicBuilt-in USB charging portBuilt-in microphone with clear call through Bluetooth handsfree functionBuilt-in high-quality speakers bright treble deep bassHigh capacity rechargeable Li-ion polymer battery for longer music playSpecifications:Bluetooth version: 2.1 EDRReceive range: within 10 metersOutput power: 3WDriver units: 2Ω 3WFrequency range: 30Hz-20kHzReceiving sensitivity: better than -90dBmMIC sensitivity: -32dBCharge voltage: DC 5V/500mABattery: 1100mAh polymer lithium battery