Feature 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 builtin 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.SpecificationItem Type: Car Bluetooth Cassette AdapterMaterial: ABS PlasticColour: BlackProduct Size: Approx. 10x6.4x0.9cm / 3.9x2.5x0.4in(there is an error due to manual measurement) Bluetooth Answer/Call: supportAudio Format: AAC, MP3, for SBC, stereoBluetooth Support: 5.0 + EDRIndicator Light: blue, redTransmission Distance: Approx. 10m / 32.8ftBuilt-in Battery: 140 mAh lithium batteryCharging Current: 80mAWorking Voltage: 3.3-4.2VCharging Input Voltage: 4.5 V- 5.3VOutput Mode: Bluetooth .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Cassette Adapter1 x Charging Cable1 x Manual