UEB FM Wireless Microphone Headset Megaphone Radio Mic for Loudspeaker High-definition digital tube display frequency, makes operation more easy and convenient The built-in polymer 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! Super multi-channel optional, will not interfere with each other 200 optional channel! The use of a single wireless FM microphone, can make two hundred loudspeaker devices and public address broadcast at the same time, think about what the situation