JS4 2 in 1 Car Digital Display Wireless Audio Adapter 3.5mm Audio Receiver Transmitter 1. Small and light, does not take up space, easy to carry. 2. Adopts Bluetooth 5.4 technology to achieve stable and efficient wireless connection. 3. Freely switch between receiving and transmitting signal dual modes, widely compatible with a variety of devices and suitable for a variety of scenarios. 4. Built-in rechargeable lithium battery, Type-C charging interface, can work and use for a long time after charging once. 5. Smart LED digital display screen, the product usage status is clear at a glance. 6. Anti-bending plug design, plug-in resistant, pull-resistant, durable. 7. With protective cover, easy to use. Parameters 1. Bluetooth version: V5.4 2. Audio decoding: SBC 3. Supported protocols: HSP, HFP, A2DP, AVRCP 4. Transmission range: less than or equal to 10m 5. Product input: 5V1A 6. Input interface: AUX 3.5mm 7. Charging interface: Type-C 8. Product material: ABS 9. Product size: 124x51x14.6mm