Features: brand new and high quality BT-4.2 transmitter is used to transmit audio signal to TV, computer, dvd, and MP3 and other Bluetooth-compatible audio transmitters. It is connected with headphones or speakers through Bluetooth-compatible wireless technology, and the operation is simple. Support high definition music streaming. Usb powered, no for time limit. Plug and for play, no driver doftware required. Exquisite shape design, perfect craftsmanship, mini body, smaller and lighter USB power supply design, no need to consider the power issue, so that you can easily enjoy high-quality stereo transmission all the for time, ensuring you can enjoy the auditory feast. Steps: 2 seconds after plugging into the USB port, it will automatically search for new devices, and the blue light will flash quickly. The blue light flashes slowly after a successful connection to a device. Shutdown: Unplug the device Specifications: Product Name: Bluetooth-compatible Transmitter Usb Port Powered :5V(computer, 5v/charging, Etc.) Power Supply: Usb Input Voltage: for DC 5V Compatible With for Windows Xp/vista/7/8/10 Bluetooth-compatible Version: v4.2 Effective Distance: 10m/39in Color: Black Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1PC x Bluetooth-compatible Transmitter 1PC x User Manual