Features:   
-Transceiver Mode: Transmitter Mode: Wirelessly transmits audio from a non-Bluetooth TV, home stereo system or CD player to a Bluetooth headset or speaker. Receiver mode: wirelessly transfer audio from a Bluetooth-enabled phone, tablet or computer to cable stereo, speakers or headphones
-Simple operation: Switch between transmitter and receiver modes with a single tap of the switch. Easily connect using advanced Bluetooth technology and a 3.5mm audio cable (included). Ultra-portable audio stream-: Only 44 mm (1.73 inches) wide and weighs only 18 grams (0.63 ounces), but with powerful wireless audio streaming. Slide the transmitter and receiver into a backpack or laptop bag and carry it with you effortlessly.
-Broad Compatibility: This receiver transmitter adapter can be widely used in your computer, laptop, home stereo system, headset, smartphone, Mp3 player with the included 3.5mm cable and 3.5mm to 2RCA cable. , CD player, etc.     

Specifications:   
Technologies: BT4.2, A2DP, AVRCP (receiver mode only)
Operation Range: Up to 10m / 33ft (without any blocking objects)
Charging Time: 2 hours
Continuous Use Time: 6 hours (Receiver Mode) / 5 hours (Transmitter Mode)
Battery Type: Li-Polymer (200mAh)

Dimensions:
44 × 44 × 12mm   

RX Mode Pairing
1.Turn on the device. Blue light flashes quickly.
2.Then turn on the phone BT setting and search for BT device to select and pair connections.
3.Insert the 3.5mm audio into the RX port to connect the transmitter and reciever device.
4. You can enjoy the wonderful music

TX Mode Pairing
1. Turn on the device.
2. Then turn on the receiver device (BT speaker, BT headset and other BT enabled audio system ) and wait a few seconds. The device will connect with the BT transmitter automatically.
3. Then insert the 3.5mm cable into the TX port and your transmitter device (MB, TV, PC, MP3/MP4 those don’t have the BT function).
4. Finally, you can enjoy the music.

The indication light
1. the red light don't flash when you charger.
2. the red/blue light flash quickly when the device is on transmitter/receiver modern and don't pair successfully. the red/blue light flash slowly means pair successfully.   

Package:   1x Bluetooth 4.2 Audio Transmitter/Receiver Adapter 1x Micro USB Power Cable 1x RCA Cable 1x 3.5mm Aux Cable 1x User Manual