Transmitter mode wirelessly transmits audio from a non-Bluetooth TV, home stereo system or CD player to a bluetooth-compatible headset or speaker. Receiver mode wirelessly transmits audio from Bluetooth-enabled mobile phones, tablets or computers to wired stereo, speakers or headphones. Receiving mode and sending mode only need one button to switch. With the help of the included 3.5mm cable, this receiver transmitter adapter can be widely used in your computer, laptop, home stereo system, headset, smart phone, MP3 player, CD player, etc. Pairing method: RX mode: Pairing name: BT 600, find BT 600 in the bluetooth-compatible settings of the phone to be paired. The blue light flashes during the pairing process, and the blue light stops flashing after the pairing is successful. Use 3.5 audio cables to connect the product to audio equipment. TX mode: TX mode will automatically search for other bluetooth-compatible receiving devices (such as bluetooth-compatible headsets, bluetooth-compatible speakers, bluetooth-compatible receivers, etc.). The red light flashes during pairing, and the red light stops flashing after the pairing is successful. Use 3.5 audio cable / RCA audio cable to connect the product to TV and other devices. Item Name: bluetooth-compatible Adapter Material: Plastic Receiver Mode: Blue LED Light Transmitter Mode: Red LED Light Operating Range: up to 10m / 33ft (without any Obstacles) Technology: BT5.0, A2DP, AVRCP (Receiver Mode Only) Features: Durable, Plug and Play, Portable, Low Power Consumption Size: 3.3cm x 1.7cm x 1cm/1.3" x 0.67" x 0.39" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 4 x 1 x bluetooth-compatible Adapter 1 x 3.5mm Adapter