The latest Bluetooth 4.1 technology with A2DP and AVRCP Bluetooth protocol for enhanced audio quality , Strong Compatibility,Low Latency and faster pairing, intelligent compatible, Android, IOS system mobile phones and PAD, and all Bluetooth audio equipment. (Note) If your Bluetooth version is lower than version 2.1 or 3.0, it will cause signal transmission delay. Transmitter Mode: Connect the audio devices(such as MP3, MP4, TV and PC, etc.)via the audio cable or RCA. Bluetooth transmitter function wirelessly streams audio to Bluetooth speakers or headphones from your TV or older media devices like portable CD players that lack built-in Bluetooth. Receiver Mode: Turn the traditional car or home stereo, speaker or car stereo into Bluetooth-enabled ones. Pair by Bluetooth-enabled audio sources such as smartphone, tablet or laptop to enjoy music wirelessly. NOTE: The adapter needs to be set in the transmit mode (the audio cable should be plugged into the product's red earphone jack). During the charging process, current may interfere with the adapter and may generate noise. It is recommended to use it after full charge. Lightweight and portable Bluetooth Transmitter & Receiver (Easy to install and simple to operate) is an Perfect wireless audio solution for a wide range of use cases: Bluetooth Devices A2DP profile for Windows Phone, smartphone, Android, , 6, 6 Plus, Galaxy Note 4, Galaxy S5, , Fire, iPad, Nexus, Google, Tablets, Laptop, PC, & Stereo System with 3.5mm port This Bluetooth Audio Transmitter & Receiver 2-in-1 Broadcast audio output from your TV or old portable CD player to wireless speakers on the other side of the room without cumbersome cable management. Use the wireless receiver function to upgrade your audiophile home stereo system and wirelessly stream music from your phone or tablet. Function Operation: ON: press the button the blue light will blink. OFF: press the button 5s the bllue light will off. Automatic shutdown function: the device in the absence of the connection state,after 10 minutes,it will automatically go into power-saving sleep mode,the light will turn off. LED Status: red light when charging, fully charged, the red light goes out. Specifications Bluetooth Version: V4.1, Frequency Range: 2480MHZ Support Bluetooth Profile: A2DP,AVRCP,HFP,SPP HID Charging input voltage: DC 5V Input/Output connecting mode: 3.5MM stereo audio port Compatibility: compatible with phones and PAD of Android / IOS system,and all the bluetooth audio devices. When using a Bluetooth transmitter, the input audio cable should not be near the TV's power cord or other cables to avoid interfering with the audio input signal. colour: black+white Material: ABS size: 9.2 x 7.2 x 2CM Cable: 3.5mm Package Contents: 3x Bluetooth Transmitter and Receiver 2-In-1 Adapter 3x -USB Cable 3x 3.5mm Audio Cable 3x User Manual NOTE: The product is stereo output in receive mode; The B6 transmitter is determined by the performance of the chip itself. When the transmitter function is used, the output cannot reach stereo Only the above package content, other products are not included. Note: Light 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.