2-in-1 Bluetooth audio adapter with receiver and transmitter modes. TX mode: Convert wired audio to Bluetooth signal for wireless transmission to headsets or speakers. RX mode: Receive Bluetooth signal and transmit to wired audio devices. Ideal for TV (connect to 3.5mm port, TX mode) to enjoy late-night viewing without disturbing others; also works with non-Bluetooth speakers (TX mode) for wireless playback. Built-in rechargeable battery provides up to 4 hours of continuous use. Bluetooth 5.0 ensures stable connection with 10m transmission range in open areas. Features 3.5mm audio interface, ABS material, compact size (59.5x22x12mm). Color as shown. Package includes 1 Bluetooth receiver transmitter, 1 charging cable, 1 3.5mm audio head. Note: Light and different displays may cause color variation; measurement error is +/-1-3cm.