For those who are interested here are the specs for the receiver:
Bluetooth 4.2 , CSR AptX Low Latency , HiFi
✓CSR APTX Low Latency
APTX Low Latency for Bluetooth offers a total end-to-end latency of approximately 40 milliseconds (ms). That’s far less than the standard Bluetooth latency of more than 150 ms (+/-50ms), and it meets the 40 ms standard recommended latency for audio/video applications.
✓HANDS-FREE CALLING: Built-in microphone makes talking to family and friends a breeze.
✓NFC sensor area: Open the NFC function on the phone,the phone will automatically pop up a prompt box to request connection when you get close to the sensor area.
✓DUAL audio output port: Dual audio output,transmits audio to two Bluetooth headphones or speakers simultaneously.
✓DOUBLE link: Connect two Bluetooth devices at once; freedom to enjoy music or answer phone calls.
✓EXTRA-LONG Play Time
The Bluetooth adapter features a built-in rechargeable 300mAh battery so you can enjoy wireless audio up to 33ft and last for around 10 hours on a full charge. It is also available for charging and playing simultaneously.
Product specifications
Bluetooth version:4.2
Chipset:CSR64215
Working hours :10H
Charging time:about 2H
Bluetooth protocol:A2DP 1.3 ,AVRCP 1.6 ,HFP 1.6 ,HSP 1.2
CODEC: APTX LL ,APTX ,AAC ,SBC
Transmission distance:>33ft
Output connection:3.5mm stereo dual output interface
Battery capacity:300mAh
Charging Method: Micro USB 5V/0.5A
Weight: 0.93oz
size: 2.25*2.25*0.52in