Specification Bluetooth version: 5.0 Bluetooth profile: A2DP, HFP, HSP, AVRCP Audio codec: aptX-LL, aptX, FastStream, SBC Operating range: Up to 20 meters in open area without any obstruction. NOTED FOR AUDIO INPUT: USB audio input: After the transmitter is connected to the USB interface of computer,Switch base or other devices,it can transmit audio directly to the transmitter for transmitting through the usb interface. (Note: No need to insert audio cable) AUX audio input: Connecting the 3.5mm cable to the transmitter can input audio from TV,CD,MP3 or other devices to the transmitter for transmitting through the audio cable. Note: If 3.5mm audio cable is inserted when the transmitter is used for usb audio input,it will cause sound output failure of the transmitter !!! Package contents: 1 x USB Bluetooth Transmitter Adapter 1 x 3.5mm audio cable 1 x 3.5mm jack to 2 RCA plug cables(If you selected with RCA cable,Otherwise dont included) 1 x user manual