1. Universal Compatibility: Fit for all cars and trucks with cassette players, direct use of the original car built in cassette device CD player, no modification and easy to use. 2. Bluetooth 5.1 Technology: Equipped with the latest Bluetooth version, this cassette adapter ensures stable and fast wireless connection, allowing you to enjoy music without any interruptions. 3. Low Power Reminder: When the battery is low, there is a low voltage indicator and a sound alarm, intelligent detection of tape operation, reduce the battery consumption caused by forgetting to shut down. 4. Covenient: External charging structure, convenient to listen to music while charging, better experience, ensuring hours of uninterrupted music playback on the go. 5. Wireless Music Streaming: With the Bluetooth cassette receiver, you can easily stream your favorite music wirelessly from your smartphone or other Bluetooth enabled devices. Spec: Item Type: Bluetooth Cassette Receiver Bluetooth Version: 5.1 Charging Voltage: DC 5V Signal to Noise Ratio: 90dB Shipped with built-in battery Built-in Battery Type: Button Battery Battery Model: CR1220 Individual Battery Capacity: 40mAh Note: Product is built-in battery (already installed on the product) Applicable: Fit for all cars and trucks with a cassette player Package List: 1 xBluetooth Cassette Receiver 1 x Cable Car Audio Bluetooth Cassette Receiver, Bluetooth 5.1 Cassette Receiver, Tape Player Bluetooth 5.1 Cassette Aux Adapter, Tape Desk Player for Listening Music and Car Voice