Transmitter mode: Wirelessly transfer Audio from your non-BT TV, home stereo system, or CD player to your BT headphones or speakers. Receiver mode: Wirelessly transfer Audio from your BT-enabled phone, tablet, or computer to your wired stereo, speakers, or headphones. BT 5.0 technology has lower power consumption and more stable signal transmission. Support 10M long-distance stable transmission, barrier-free connection between living room and room. Receiver transmitter mode two in one, one key to switch. Working indicator, working status is clear at a glance. Support optical fiber interface and 3.5 mm AUX interface, which can be connected to TV, computer, mobile phone, power amplifier and other equipment to realize wireless transmission. Material: plastic colour: Black Package Contents: 1 x Bluetooth Transmitter Receiver 1 x Optical Cable 1 x Audio Cable 1 x English instructions 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.