Product description Specifications: Auto power on\/off. Siri voice control. Support connecting two mobiles at the same time. Support A2DP function. Built-in rechargeable lithium-ion battery 550mAh. Standby time about 500 hours. Holding time about 10 hours low power remind. Support automatic connection and private answer. Support coming call number readout. Build-in DSP noise suppression and echo. Cancellation function. English and Chinese can switch from each other. Type: Bluetooth Car Kit Material: Plastic Charging Time: 2-3 Hours Powered: Built-in 550mAh Lithium Battery Bluetooth Version: V4.2+EDR Size: 10cm x 6cm x 2.1cm Quantity: 1pc Note:Manual measurement, there may be 1-2cm\/1-3g error, which is not a quality problem. Due to different screen displPXCL, there may be a color difference between the real object and the picture, and the main picture shall prevail.