Bluetooth Cassette Adapter Bluetooth Tape Converter MP3 Player Audio Converter for Car Feature: 1. Just connect the cassette adapter to the CD player in the car, and then the cassette adapter will start playing music on your phone. 2. The builtin microphone can support the call function without delay in making and receiving calls. 3. Cassette adapter with USB charging LED indicator is convenient for charging. 4. The control button box adaptor can be easily controlled manually, easy to operate. 5. Tape converter with bluetooth 5.0 technology can conveniently play music on a smart phone via a bluetooth connection. Specification: Item Type: Car Bluetooth Cassette Adapter Material: ABS Plastic Colour: Black Product Size: Approx. 10x6.4x0.9cm / 3.9x2.5x0.4in(there is an error due to manual measurement) Bluetooth Answer/Call: support Audio Format: AAC, MP3, stereo Bluetooth Support: 5.0 + EDR Indicator Light: blue, red Transmission Distance: Approx. 10m / 32.8ft Built-in Battery: 140 mAh lithium battery Charging Current: 80mA Working Voltage: 3.3-4.2V Charging Input Voltage: 4.5 V- 5.3V Output Mode: Bluetooth Package List: 1 x Cassette Adapter 1 x Charging Cable 1 x Manual How to use: Just connect the cassette adapter to the CD player in the car. Then, the cassette adapter starts to play music on the phone for you.