AXESS MPWL1507 Headset Microphone Wireless head microphone for enhanced mobility and hands-free use High-power Magnet for Better Performance Carrier Frequency: VHF110-120MHz Includes tie clip microphone, 6.3 mm to 3.5 mm adapter, (batteries in package are not for commercial use) Great for weddings, announcement events, DJs, or school assemblies Product requires a powered (not passive) output device (speaker, amplifier, mixer) for use. (Please be sure that the receiving unit is connected to the output device via a microphone jack or auxiliary jack)