Bluetooth Transmitter, Receiver/Transmitter 【Receiver + Transmitter】 1. Receiver Mode: Transfers audio from Bluetooth devices such as smartphones to your non-Bluetooth headphones/speakers/car stereo system via a 3.5mm audio cable. 2. Transmitter Mode: Transfers audio from non-Bluetooth media devices (TVs, PCs, CD/DVD players, etc.) to Bluetooth headphones or Bluetooth speakers via a 3.5mm audio cable. 【Easily Switch Modes】 The LED lamp flashes red in TX transmission mode, and flashes blue in RX reception mode. When Bluetooth pairing is complete, the LED lamp lights up constantly. 【Bluetooth 5.0 + EDR】 With enhanced V5.0 + EDR technology, our audio adapter can connect to devices more stably. The communication range is approximately 10M (theoretical value). 【Powered by USB】 USB only provides power (except when used with a PC without Bluetooth). During use, please supply power from a USB port such as a USB power adapter, computer, or car charger. 【Wide Compatibility】 With the included 3.5mm cable, it can be used not only with PCs without Bluetooth, but also with various devices without Bluetooth. For example, in transmitter mode, it can be used with equipment with a 3.5mm audio jack, such as computers, TVs, DVDs, and projectors. In receiver mode, it can be used with devices without Bluetooth, such as speakers and headsets. Pairing Method 1. TX Transmission Mode Set the mode switch of this product to "TX". Connect this product to a power USB port, and the LED lamp will flash red. Connect this product to a device such as a TV with a 3.5mm audio cable. Put your Bluetooth earphones/speakers into Bluetooth pairing mode, and this product will automatically search for and pair with the earphones. During pairing, the LED lamp flashes red, and when pairing is complete, it lights up constantly. 2. When using TX transmission mode with a PC without Bluetooth: Set the mode switch of this product to "TX".