The WLH-410 Wireless Handheld Microphones (Set of 4) is designed for public announcements in conference centers, hotels, shops, restaurants, schools, etc. These microphones are powered by rechargeable batteries which enable up to 12 hours of continuous usage, thus making it cost effective. The simple operation and fast set up make it perfect for usage in flexible spaces and upgrading existing environments and structures where cabling is not easily possible. With its compact and lightweight body as well as the freedom to move while speaking, gives one the room to focus and amplify their voice to deliver or record lectures with superior sound quality.