1. 【Three-in-One: Bluetooth Transmitter / Bluetooth Receiver / Bypass】 The B03 Bluetooth transceiver has three modes (transmitter/receiver/bypass) for 3.5mm AUX analog signals and optical fiber digital signal input/output, offering the most flexible wiring and usage modes. The B03 is compatible with TVs, home audio systems, and all Bluetooth earphones/Bluetooth speakers with all audio outputs/inputs. Please note: When connecting to the TV optical digital output interface in transmitter mode, set the TV audio format to PCM. Dolby/DTS are not supported. 2. 【50m Ultra-Long Wireless Distance】 When the B03 Bluetooth transmitter was tested in a wide outdoor environment, its transmission distance reached an amazing 70m, and it also achieved a satisfactory transmission distance of 25-30m indoors. We have also incorporated aptX LL technology to eliminate Bluetooth audio delay, allowing you to freely walk around your home without losing sound while carrying your phone or Bluetooth earphones. Please note: The transmission range may be affected by obstacles, microwave ovens, Wi-Fi routers, or other wireless adapters, and also varies depending on the receiving device. It is recommended to avoid these radio interferences when using the B03 Bluetooth receiver. 3. 【Easy Connection/Can connect to two Bluetooth earphones/speakers simultaneously.】 Connect the B03 audio receiver Bluetooth to your audio system/TV and pair it with your phone, tablet, or Bluetooth headset to enjoy wireless audio. The B03 Bluetooth transmitter automatically remembers the settings after the power is turned off, and stores Bluetooth pairing records for up to 8 devices, bringing convenience to customers. Thank you for viewing.