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Main MPU: CSRBC5MM
Bluetooth version: 2.1+ EDR
Bluetooth frequency range: 2.402-2.480GHz
Effective range: Up to 10 meters (30 feet)
Bluetooth profile support: A2DP， SBC， MP3 and AAC， CLASS 2
Multipoint HFP: connection to 2 phones
Current Consumption: Operational - Less than 18 mA (active)
Dimensions: 50*24*8.5mm
Inner Li-battery: 100mA
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Package Included:
1x Bluetooth Adapter
1x USB Cable
1x User Manual
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Methods used
1. Turn on the Transmitter/Receiver Mode as you need， then long press the Multi-functional button， it will power on with blue light， and if you long press again it will power off with red light.
2. Receiver Mode: long press about 4s to power it on， it will be in the searching state and Red and Blue lights flash alternately. Search the device"Link-BT4821"and connect to it. You can play music wireless when it is paired then press the multi-functional Button to pause and press it again to play.
Notice: You should power it off when you want to switch the function.
3. Transmitter Mode: Long press to power it on， it will be in searching state with Blue light flashing quickly. You can connect it with your TV， mp3， mp4， and DVD players by using the 3.5mm audio cable. Turn on the Bluetooth receiver， and you will hear the Audio in the Bluetooth receiver after they have been paired.
Notice: You should power it off when you want to open the function.
4. Connect Two Receivers: Transmitter Mode， turn off the first paired Bluetooth device and restart the adapter to pair the second Bluetooth device， then turn on the first paired device， connect with it. In this way， it can connect two receivers at the same time.
5. It will be re-connected to the device that paired before when power on. When the device is out of the working range， it will disconnect， once the device back into the valid range， it will connect back automatically.
6. When the device is in low power state， it will alarm; it will power off automatically if the voltage is below 3.0V.
7. Charging: connect with USB charging cable， the red indicator will light constantly; it will go out when finished.
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