Bluetooth 5.0, 4 hours battery life, lossless sound quality, hands-free calling, plug and play auxiliary port - Bluetooth transmission mode (tx): Converts wired audio to Bluetooth signal and transmits to Bluetooth device for output - Bluetooth receive mode (rx): Receive Bluetooth ...Bluetooth 5.0, 4 hours battery life, lossless sound quality, hands-free calling, plug and play auxiliary port - Bluetooth transmission mode (tx): Converts wired audio to Bluetooth signal and transmits to Bluetooth device for output - Bluetooth receive mode (rx): Receive Bluetooth signal and transmit to wired audio via Bluetooth connection - Bluetooth 5.0 for music listening: low power consumption and stable high-speed signal transmission, listen to music more smoothly - Applicable type: Computer, TV, projector (send mode)/speaker, earphone (receive mode)Package Includes:1 *Adapter1 *Charging cable1 *3.5mm audio head1 * Manual