FCC Equipment Authorized Identifier: 2A8D5-V20. Operates frequency: 658.8一658.8 Mhz band. Introducing our 2-Pack USB Professional Wireless Microphone System Kits with Receiver the perfect solution for those looking for a wireless experience. You ll never have to worry about annoying wires getting in the way again! Our microphone system allowing you to showcase your voice with ease and perfection. The complete electronic circuit control ensures that you capture rich full-bodied sound from sources that are directly in front of the microphone making your voice sound crystal clear. The microphones can be used with devices that have 3.5mm and 6.35mm female interfaces making them compatible with a variety of devices. (Please note that they are not supported plug-in AUX jack.) Worried about power? No need to be! The USB receiver can be powered by a USB charger power bank or other similar devices so you won t have to worry about charging. The microphones on the other hand are powered by 2 AA batteries making them easy to replace. Our Wireless Microphone System Kits are suitable for a variety of uses including studio work karaoke PA systems DJing singing machines voice amplifiers teacher guides and more. They re perfect for anyone who needs a reliable high-quality microphone system for any occasion. Order our 2-Pack USB Wireless Microphone System Kits with Receiver today and enjoy the freedom of wireless microphones without any of the hassle!