HAVIT Bluetooth 4.1 Transmitter Receiver(aptX), Pair 2 at Once, Mini Wireless Portable Bluetooth Adapter to 3.5mm Audio Devices and Home Stereo, Such as TV, MP3, CD Player, PC, eBook Reader (HV-BT018) Low Delay: Bluetooth 4.1 technology, powered by premium CSR8670 chip with aptX. aptX supported Bluetooth receiver is required. Bluetooth Transmitter: Can help transmitting stereo audio wirelessly from your non-Bluetooth audio sources such as TV, MP3, CD player, PC to your Bluetooth-enabled headphones, speaker or other receiver device. Bluetooth Receiver: Can connect it with non-Bluetooth headphones, speaker or car stereo via 3.5mm cable, and pair it with Bluetooth-enabled audio sources to wirelessly enjoy music from your smartphone, tablet or laptop A 2 for 1 Connection: As a Bluetooth transmitter, two Bluetooth headphones or speakers can pair at once. As a Bluetooth receiver, it can still be paired to two of your smartphones or tablets, but can only receive the audio from one of the two paired devices. Extra-long Play Time: Build-in 280mAh rechargeable lithium battery ensures music play for about 14 hours and phone calling for about 14 hours.