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 and 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, videos,and classroom and presentation applications. Versatile and Compatible Microphone-Work with mixers, pa speakers, electric guitar amplifiers and sound boards with 1 or 4 inch interface to output the sound, perfect for teaching lectures,conference speech, visiting guide.With included 1 or 4 inch to 1 or 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-18kHz3dB Max. Deviation Range Frequency offset: 50kHz (with level limiting) T.D. Total harmonic distortion: Less than 1.0 percent 1kHz S signal to noise ratio: more than the 98dB Working Range Use distance: Up to 50m RF Carrier Stability: 0.005 percent (-1050C) 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 or 1A) Handheld microphone (metal) Carrier Frequency Power Transmitting power: 30mw Battery Type Battery specifications: 2xAA Size Working Time Use time: Up to 10 hrs Dimension Colour:black Material:ABS Size:93x31x20mm Package Contents: 1x pocket transmitter 1x receiver 1x headset microphone 1x lavalier microphone Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.