Specification: Item Type: Car Bluetooth Cassette Adapter_x000D_Material: ABS Plastic_x000D_Colour: Black_x000D_Product Size: Approx. 10x6.4x0.9cm / 3.9x2.5x0.4in(there is an error due to manual measurement) _x000D_Bluetooth Answer/Call: support_x000D_Audio Format: AAC, MP3, for SBC, stereo_x000D_Bluetooth Support: 5.0 + EDR_x000D_Indicator Light: blue, red_x000D_Transmission Distance: Approx. 10m / 32.8ft_x000D_Built-in Battery: 140 mAh lithium battery_x000D_Charging Current: 80mA_x000D_Working Voltage: 3.3-4.2V_x000D_Charging Input Voltage: 4.5 V- 5.3V_x000D_Output Mode: Bluetooth Features: 1Just connect the cassette adapter to the CD player in the car, and then the cassette adapter will start playing music on your phone. 2The built?in microphone can support the call function without delay in making and receiving calls. 3Cassette adapter with USB charging LED indicator is convenient for charging. 4The control button box adaptor can be easily controlled manually, easy to operate. 5Tape converter with bluetooth 5.0 technology can conveniently play music on a smart phone via a bluetooth connection. PackageList: 1 x Cassette Adapter 1 x Charging Cable 1 x Manual