TRANSMITTER + RECIEVER: One portable adapter to use as either transmitter or receiver, powered by the latest Bluetooth 4.2 with multipoint, can pair with two headphones or speakers at once LOW LATENCY, INSTANT SOUND: aptX, A2DP & AVRCP Low Latency support enables users to enjoy high-quality audio in sync with the picture (Note: aptX Low Latency enabled Bluetooth headphones or speakers are also required. Aptx doesn't support RX mode. You may not use it for instrument intentions where users expect instant feedback.) CONSTANT STREAMING AND AUTOMATIC RE-PAIRING: Internal battery provides up to 8 hours of usage, supports charging and streaming at the same time, and automatically re-pair with existing paired devices Multi-point Bluetooth capability allows you to connect to 2 devices at the same time, ideal for shared listening Use while charging, or fully charge for upto 8 hours use without being powered via wired USB