Feature: High-definition digital tube display frequency, makes operation more easy and convenient. The built-in battery not only can be used repeatedly charging, and light weight use safety. A single charge can always use more than 10 hours, long battery life. There is no limit on the amplification products, mainly to accept FM radio signals and electronic equipment with audio playback function can be used instantly into a megaphone. Small and exquisite, portable, amplification function anytime and anywhere. Widely used: teaching, tour guide, sales promotion, lectures, meetings, karaoke, fans singing and so on. FM Wireless Microphone Headset only, other accessories demo in the picture is not included! Specifications: Item Type: FM Wireless Microphone Headset Size: 14x4x17cm/5.5x1.5x6.6in Color: Black Resistance: 680Ohm Sensitivity: -52dB1.5dB Wireless Distance: 15-20m/49-65in Transmission Frequency: 87Mhz-108Mhz Quantity: 1 Pc Operating Steps: 1.Switch on the main power supply of microphone, and the Screen will display radio station band number. 2.Press the"+" "-" key to adjust the radio frequency, and choose a band number between 87.5MHz-108MHz.(Note: Select the number that it dose not exit in local radio frequency bands, for example 89.7.) 3.Turn on the machine that with FM radio function, stretch antenna and tuned to FM radio mode, tune radio frequency into the same with the number of display. And you can use the Wireless microphone after the machine matching pair with the ratio frequency. 4.Put the Microphone on your head and speak into the microphone, you can amplify your voice. Note: Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x FM Wireless Microphone Headset 1 x Charging Cable 1 x User Manual