Feature: High-definition digital tube display frequency, makes operation more easy and convenient. The built-in battery can be recharged repeatedly and is lightweight for safe use. A single charge provides over 10 hours of continuous use, offering long battery life. No restrictions on amplification products; mainly receives FM radio signals. Any electronic device with audio playback function can instantly become a megaphone. Compact and portable design allows amplification anytime and anywhere. Widely used for teaching, tour guiding, sales promotion, lectures, meetings, karaoke, and singing performances. FM Wireless Microphone Headset only; other accessories shown in the picture are not included. Specifications: Item Type: FM Wireless Microphone Headset Size: 14x4x17cm / 5.5x1.5x6.6in Color: Black Resistance: 680 Ohm Sensitivity: -52dB ±1.5dB Wireless Distance: 15-20m / 49-65ft Transmission Frequency: 87MHz–108MHz Quantity: 1 Piece Operating Steps: 1. Turn on the microphone power; the screen will display the radio station band number. 2. Press the "+" or "-" key to adjust the radio frequency and select a channel between 87.5MHz–108MHz. (Note: Choose a frequency not already occupied by local radio stations, such as 89.7.) 3. Turn on the device with FM radio function, extend the antenna, switch to FM radio mode, and tune it to the same frequency displayed on the microphone. Once matched, the wireless microphone is ready to use. 4. Wear the microphone headset and speak into it to amplify your voice. Note: Conversion: 1cm = 10mm = 0.39inch Please allow 0–1cm measurement deviation due to manual measurement. Ensure you are comfortable with this before purchasing. Due to differences in monitor displays, the image 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