2-in-1 Design Bluetooth adapter combines Bluetooth audio transmitter and receiver in one with 3.5mm aux jack. Bluetooth connection is more stable and the wireless range is over 10m. Easy to pair and compatible with 99.9% of Bluetooth devices. Updated Bluetooth 5.0 ensures strong signal transmission, high sound quality, less crackling, hissing or sound degradation.Dual Connection When used as a Bluetooth transmitter, it can be paired with two Bluetooth receivers such as headphones and speakers simultaneously. When working as a Bluetooth receiver, it can still be paired with two smartphones or tablets, but the receiver can only receive the audio from one of the two paired devices. Please note that it only supports SBC codec when paired with two devices simultaneously.Small Size BUT Long Battery Life Built-in 300mAh polymer battery, it can work up to 8 hours when using as a receiver and up to 6 hours as a transmitter. Enjoy superior stereo sound more with longer time compared with other brands at the same price.Bluetooth Everywhere As a Bluetooth audio transmitter (TX Mode), transform a non-Bluetooth TV, PC, CD player, iPod, Laptop, Tablet, MP3 / MP4 (including but not limited to) into a Bluetooth transmitter with 3.5mm input port. As a Bluetooth audio receiver (RX Mode), it is ideal for home or vehicle music streaming sound system. Enjoy HIFI CD-like audio freely.