Feature:1. Wireless 3.5mm Jack Aux Adapter: This car Bluetooth adapter can be connected to all types of speakers via the 3.5mm AUX adapter, stable connection, fast transmission, wide signal range.2. Convenient to Use: Compatible with most Bluetooth enabled devices, such as smart phones, and computers. You can take this Bluetooth receiver whenever you go. Very good companion for drivers.3. Built in MIC: Connect to your phone's Bluetooth for making calls and voice conversations as well, providing you with crystal clear calling sounds. Providing you with nice call experience, and also ensuring your safety.4. Multiple Uses: Supports connecting headphones, amplifiers, speakers. Use Bluetooth receiver in the car, through the home theater system, in the kitchen, bathroom, or bedroom, it's convenient for any setting.5. Long Battery Life: Powered by a built in rechargeable 55mAh lithium ion battery, long working time with low power consumption. Charge the device by using USB charging cable (Included in the package).Specification:Item Type: Car Bluetooth ReceiverMaterial: ABS, MetalBuilt in Battery: 55mAh Lithium Ion Battery.Package List:3 x Car Bluetooth Receiver3 x USB Cable3 x 3.5mm AUX Adapter3 x User Manual