Bluetooth Transmitters features: Universal 3in1 USB Bluetooth 5.0 Audio Transmitter Receiver 3.5mm Adapter For TV Color: we send based on the color or size of the main image of the product page. Quantity：we send based on quantity on title, if there is no quantity in the title, we send based on description. This portable, lightweight wireless audio transmitter and receiver is an ideal wireless audio solution for various situations and purposes, and can be used with computers, mobile phones, TVs, home speakers, and car speakers. Use the latest Bluetooth 5.0 technology, fast transmission speed, high-quality stereo music, and enjoy the convenience that Bluetooth technology brings to life. Product specifications: Product model: KN330 Bluetooth version: BLUETOOTH 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 Mode switching: Use TX/RX switch to switch the mode. TX is the transmission mode (red LED). RX is the receiver mode (blue LED) 1. No built-in battery, powered by DC 5V usb interface 2. Plug in the usb to turn on, the red light will be on in the transmit mode, the red light will flash when