Description: Portable, lightweight wireless audio transmitter & receiver, great for a wide range of situations and uses Transmitter mode: wirelessly streams audio from your non- TV, home stereo system, or CD player to your headphones or speakers Receiver mode: wirelessly streams audio from your -enabled phone, tablet, or computer to your wired stereo, speakers, or headphones Transmitter and receiver, One-click switch, Blue light on means to enter the receiving mode,Red light on means to enter launch mode, One-click answer/end call. With the 3.5mm cable, this Receiver Transmitter adapter can widely be used on your car,computer, laptop, home stereo system, headphone, smartphone, Mp3 player, CD player, etc. Specification: Type: 4 in 1 USB Adapter Model: T7 Material: Plastic+Electronics Size:45 x 20 x11mm/1.8 x 0.8 x 0.4 inch Technologies: BT5.0, A2DP, AVRCP (receiver mode only) Operation Range: Up to 15m / 42ft (without any blocking objects) TX:Transmitter mode, red LED light is on RX:Receiver mode,blue LED light is on Features: No need to drive, answer the phone, Accept/ launch, Built-in noise reduction,15 meters transmission,Automatic matching Package Includes: 1 Piece 5.0 Audio Transmitter Receiver 1 Piece 3.5mm Aux Cable 1 Piece User Manual Note: 1.Please allow 1~3 cm error due to manual measurement, thanks. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you.