Description/Features: 1. Rich interfaces and versatile design to meet the needs of different devices 2. Multiple connection methods, easy connection, no driver required 3. Upgraded Bluetooth 5.3 for improved performance and reduced latency 4. High-definition audio playback with low delay for music listening 5. Supports U disk playback, plug and play, no driver required Specifications: Interface: RCA, optical, USB, AUX Transmission rate: 100 Mbps Working frequency: 2.4 MHz Effective working radius: 10 m Size: 6.7 x 5 x 2 cm Material: plastic Color: black Package Contents: 1 x Bluetooth adapter 1 x 3.5 mm AUX audio cable 1 x RCA audio cable 1 x Optical audio cable 1 x Type-C charging cable 1 x English instruction manual Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the actual product. Measurement may vary by +/- 1-3 cm.