2-In-1 Design The Bluetooth adapter combines Bluetooth audio transmitter and receiver in one with an 3.5 mm Aux jack. Bluetooth connection is more stable and wireless range is more than 33 feet. Easy to pair and compatible with 99.9% Bluetooth devices. Updated Bluetooth 5.0 ensures strong signal transmission, high sound quality, less crackling, hissing or sound deterioration.Dual connection When used as a Bluetooth transmitter, it can be paired to two Bluetooth receivers such as headphones and speakers simultaneously. When working as a Bluetooth receiver, it can still be paired to 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 the codec of SBC when paired with two devices simultaneously.Small Size BUT Long Battery Life Built-in 300 mAh polymer battery, it can work up to 8 hours when used as a receiver and up to 6 hours as a transmitter. Enjoy superior stereo sound more with longer time compared to other brands at same price.Bluetooth Everywhere As a Bluetooth Audio Transmitter (TX Mode), turn a non-Bluetooth TV, PC, CD player, iPod, Laptop, Tablet, MP3 / MP4 (including but not limited to) into a Bluetooth transmitter with 3.5mm jack input port. As Bluetooth Audio Receiver (RX Mode),it is ideal for home or vehicle music streaming sound system. Enjoy HIFI CD-like audio freely.