2 in 1: allows Bluetooth function streaming to almost any TV, PC or MP4 player in TX mode for wireless audio streaming; RX mode adds Bluetooth functionality to a range of non-Bluetooth headphones or speakers to enjoy high-quality music Perfectly synchronized and stereo 5.0 technology: Ultra stable 5.0 support and aptx Premium low latency, delivering a seamless synchronous streaming experience up to 10 meters in TX mode and high-resolution stereo sound without sound. Delays [TX & RX Mode Multiple Connection]: In TX & Rx mode, you can pair up to 2 devices simultaneously to share the fun with your loved ones. Note that when dual connection is not supported for low latency Excellent battery: The built-in battery can be used for 10 hours in transmitter mode and up to 12 hours in receiver mode. This Bluetooth auxiliary adapter supports play while charging. Enjoy your favorite content wirelessly anytime. Wide application: as a Bluetooth audio transmitter (TX mode), convert TV, PC, CD player, iPod, laptop, tablet, MP3 / MP4 (included but not limited) in Bluetooth transmitter with 3.5mm jack. As a Bluetooth audio receiver (RX), ideal for home or car music streaming audio systems. Enjoy high fidelity sound like CD. Support audio equipment with audio input interface for wireless audio reception and transmission Support support automatic search and Bluetooth connection for wireless audio transmission Bluetooth version: 5.0 Size: 135*80*20mm, weight: 63.4g Load: DC 5V Battery: 300mha Working hours: 5 hours Charging time: 2 hours Output: 3.5mm audio output This product is connected to a Bluetooth device (such as a mobile phone) to input audio with the interface aux to other audio devices without Bluetooth function This product connects to an aux and Player device to transmit audio via Bluetooth to a Bluetooth receiving device (such as a Bluetooth headset)