Pyle Instrument Dynamic Microphone (PDWM2115) Carrier Frequency:170-260MHz Frequency Stability: 0.002% RF Power Output: &gt;13dBm Harmonic at higher Degree: &lt;60dB Modulation Degree: &gt;30KHz Modulation Pattern: FM Power Current: &lt;110mA Battery Type: DC 3V Sturdy metal construction for heavy use, comfortable for  use during performances Cardioid dynamic cartridge is specially designed for clear, robust sound. Great sound pickup and interference-free sound transmission with maximum feedback rejection Quick and easy pair up with receiver via IR synchronization Infrared Synchronization Technology enhances frequency  search and pairs up receiver and transmitter quickly. The PDWM2115 VHF Wireless Microphone System from Pyle Pro offers high levels of frequency stability and accuracy, which ensures excellent sound quality and decreases drop-off. Up to 70 channel selections and up to 50 meters operating distance in wide open space. Metal clip-on and metal wired boom. Lapel mic and headset mic can be plugged  into any audio sound system with mini XLR jack and transmit sound  interference-free Micro multi-directional condenser cartridge specially designed for great sound pickup and premium sound reproduction.