Product usage: This portable and wireless audio transmitter and receiver is an ideal wireless audio solution suitable for various situations and purposes Transmission mode: wirelessly transmit audio from non Bluetooth , home stereo systems, or CD players to Bluetooth headphones or speakers Reception mode: wirelessly transmit audio from Bluetooth enabled phones, tablets, or computers to wired stereo, speakers, or headphones Wide compatibility: Equipped with a 3.5mm cable, this receiver transmitter adapter can be widely used for your computer, laptop, home stereo system, headphones, smartphone, MP3 player, CD player, and more. Product parameters: Technology: BT5.0, A2DP, AVRCP (receiver mode only) Operating range: maximum 10 meters/33 feet (accessible) Pairing name (receiving method): -169 Transmitter mode: The red LED light is on Receiver mode: Blue LED light on Matching method Reception mode: pairing name, find the pairing in the Bluetooth settings of the phone. The blue light flashes during the pairing process, and stops flashing after successful pairing. Connect the product to the audio device using a 3.5 audio cable. Sending mode: Sending mode automatically search for other Bluetooth receiving devices (such as Bluetooth earphones, Bluetooth speakers, Bluetooth receivers, etc.). The red light flash during pairing and stop flashing after successful pairing. Connect the product to devices such as a TV using a 3.5/ audio cable. Color:Black Material:PVC + Metal Package Contents: 1set * mini Bluetooth transmitters 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.