UHF Frequencies--The wireless lapel microphone system has 20 frequencies selection for seamless, interference-free operation.An easy-to-read LCD information display provides constant monitoring of system operation, Receiver battery condition indicators with low-battery warnings. Convenient and easy to use-- No static,no drop out with use at a distance of 40-65 feet.With unique paired ID synchronization for each wireless transmitter and receiver make setup easy.Setting up a wireless mic is as simple as plugging in a wired microphone. Wireless Headset & Lavalier--Headset microphone fits securely for active speakers and vocal performers.Lavalier microphone with included tie clip offers low visibility and hands-free use.optimized for Houses of Worship in a church preaching,YouTube videos,and classroom and presentation applications. Versatile and Compatible Microphone-Work with mixers, pa speakers, electric guitar amplifiers and sound boards with 1/4 inch interface to output the sound, perfect for teaching lectures,conference speech, visiting guide.With included 1/4 inch to 1/8 inch adapter-cable,suit for camera recording. Technical parameters: Modulation Mode Modulation method: Digital Frequency Modulate Frequency Range Frequency range: UHF 500~980MHz Preset Frequencies Preset spelling point: 8 (auto paring) Frequency response: 75Hz~18kHz±3dB Max. Deviation Range Frequency offset: ±50kHz (with level limiting) T.H.D. Total harmonic distortion: Less than 1.0% @ 1kHz S/N signal to noise ratio: more than the 98dB Working Range Use distance: Up to 50m RF Carrier Stability: ±0.005% (-10°--50°C) Micro-Receiver (Metal) Dimension Power supply: Built-in Li-on rechargeable battery (500mA) Power Consumption Power consumption: 80mA Battery Life Use time: Up to 6 hrs Recharging Time Charging time: About 1 hour (5V/1A) Handheld microphone (metal) Carrier Frequency Power Transmitting power: 30mw Battery Type Battery specifications: 2 x AA Size Working Time Use time: Up to 10 hrs