Features: Two-in-one Bluetooth transmitter and receiver, both transmitting mode and receiving mode are two-channel stereo. Receiver: Support USB and AUX dual output mode. USB does not need to be connected to audio cable, aux needs to be connected to audio cable. Transmitter: supports plug-and-play for computer game consoles, no audio cable is required to connect to Bluetooth headsets or Bluetooth speakers. At the same time, other devices (such as TV) are also supported, and audio cables are required. Support Apple headset, support Bluetooth hands-free call Use the TX/RX switch to switch the mode. TX is the transmission mode (red LED). RX is the receiver mode (blue LED) Specification: Product model: KN330 Bluetooth version: BLUETOO 5.0 Operating range: up to 10 meters / 33 feet (no obstructing objects) Pairing name: KN330 (in receiving mode) T X mode: Transmitter mode, red LED light is on R X mode: receiver mode, blue LED light is on Product size: 45mm*20mm*11mm Package: 1*KN330 Bluetooth 5.0 audio transmitter