Feature: 1. Having both transmitting and receiving functions at the same time, and can be switched freely, with high practicality, giving you an unforgettable experience 2. Having a light and compact appearance design, so easy to carry, and plug and play, easy to use, no need to install a driver, to meet your needs anytime, anywhere 3. Can be connected to a BT keyboard, mouse, and gamepad, allowing you to enjoy wireless and flexible operation, making office more efficient and playing games more freely 4. Using BT 5.0 high‑performance chip, the wireless connection rate is improved, and the stability is improved, which effectively saves office time and ensures the efficiency of file transmission 5. With good compatibility, it can be applied to your computer, laptop, home stereo system, earphone, smart phone, Mp3 player, CD player, etc. through 3.5mm/0.13in cable Specification: Item Type: BT Adapter Material: ABS BT Version: BT5.0 Technology: AVRCP (receiver mode only), A2DP Signal Transmission Distance: 10 Meters/10.9yd Pairing Name (receiving method): KN320 Transmitter Mode: Wirelessly Transmit Audio From a Non-BT TV, Home Stereo System or CD Player to a BT Headset or Speaker (red led light is on) Receiver Mode: Wirelessly Transmit Audio from a BT-enabled Mobile Phone, Tablet or Computer to a Wired Stereo, Speaker or Headset (blue led light is on). Package List: 1 x BT Adapter1 x 3.5mm Audio Cable1 x User Manual