Bluetooth Receiver. Features: The μBTR features independent local volume control, which means that you can adjust both the Bluetooth device’s volume and the μBTR’s own volume separately. The built-in high sensitivity omnidirectional microphone allows others to hear you clearly, without you having to sacrifice your music. Listen with the μBTR continuously for a long 9 hours with its 120 mAh battery, and then spend just 1 hour to top the battery off and do it all over again. For more convenience, the μBTR can be paired up to two Bluetooth devices so that you can waste less time switching back-and-forth between your favorite gadgets. Specs: Bluetooth 4.1 supported. NFC supported. Headphone Output: 3.5 mm stereo jack. Frequency Response: 20～20 kHz (aptX connection). Including USB-C charging cable. Dimensions: 55 x 19 x 9.1 mm. Weight: 13 g.