1. Features: High-definition digital tube display frequency for easier and more convenient operation; Built-in rechargeable battery with light weight and safety; A single charge supports use for more than 10 hours with long battery life; No limit on amplification products, mainly accepts FM radio signals and can be instantly used as a megaphone with electronic equipment having audio playback function; Small, exquisite, portable for amplification anytime and anywhere; Widely used in teaching, tour guiding, sales promotion, lectures, meetings, karaoke, fans singing, etc. 2. Specifications: Item Type: FM Wireless Microphone Headset; Size: 14x4x17cm/5.5x1.5x6.6in; Color: Black; Resistance: 680Ohm; Sensitivity: -52dB±1.5dB; Wireless Distance: 15-20m/49-65in; Transmission Frequency: 87Mhz-108Mhz; Quantity: 1 Pc. 3. Operating Steps: 1. Switch on the main power supply of the microphone, and the screen will display the 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 does not exist in local radio frequency bands, for example 89.7). 3. Turn on the machine with FM radio function, stretch the antenna, tune to FM radio mode, and adjust the radio frequency to the same as the displayed number. The wireless microphone can be used after the machine matches the radio frequency. 4. Put the microphone on your head and speak into it to amplify your voice. 4. Notes: Transition: 1cm=10mm=0.39inch; Please allow 0-1cm error due to manual measurement. Please make sure you do not mind before bidding; Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! 5. Package Includes: 1 x FM Wireless Microphone Headset; 1 x Charging Cable; 1 x User Manual.