Name: Audio Adapter Transmitter Bluetooth-compatible version: V5.1; Audio decoding: ; Built-in battery: 3.7V/500mAh; Charging time: about 1.5 hours; Endurance: RX about 15H, TX about 15H; Bluetooth-compatible protocol support: A2DP/AVRCP; File format: MP3/WAV/FLAC/APE; Frequency range: 2400MHz-2483.5MHz; Frequency response: 20Hz-20KHz; Output load: 16-320Ω adaptive; Transmission distance: 0-30M (open place); Audio input: Bluetooth-compatible Audio, U disk, AUX, ; Output: AUX, ; Power supply interface: USB-C 5V; Compatibility: compatible for Android, mobile phones, tablets, , game consoles and other Bluetooth-compatible devices, and audio equipment with audio input interface; Color: Black Material: ABS Package Contents: 1 * Receiver/Transmitter 1 * Remote Control Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.