Features: The latest BLE5.0 technology ensures stable transmission with low power loss. Compatibility with almost all A2DP stereo wireless devices on the market. Suitable for all speakers with USB port. Supports playback and answering phone calls. Multifunction button, convenient to use. Specifications: Material: ABS+Electronics Color: black Size: approx. 5.5x2.1x1.1cm/2.16x0.82x0.43inch Standard: BLE5.0 Output: USB port & 3.5mm Operating distance: less than 10m Power supply: 5V Compatibility: All A2DP stereo wireless devices Transmission rate: up to 10Mbps Package Includes: 1Pc Car Transmitter 1Pc 3.5mm Cable note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.