Sending and receiving: Bluetooth 5.2 audio transmitter and receiver in one adapter, TX+RX dual-mode design, one-button switching between devices to meet various needs. High-fidelity audio output interfaces: 3.5mm audio jack and Type-C port, compatible with different audio devices and amplifiers. Universal Type-C interface supports both data transmission and charging. Built-in high-capacity battery provides up to 20 hours of continuous playback. Integrated antenna design ensures high sensitivity, strong signal penetration, and long-range transmission of up to 20 meters. Color may vary slightly between batches; this does not affect performance. Color: Silver Gray Material: ABS + aluminum alloy Size: 79 x 52 x 16mm Package Contents: 1 x Bluetooth Transceiver 1 x USB Charging Cable 1 x 3.5mm Audio Cable 1 x RCA Audio Conversion Cable Note: Other items not included. Light reflection and screen differences may cause slight color variations. Measurement error allowed within +/- 1-3 cm.