Thank you very much for viewing. This product is a UHF automatic transmitter for dynamic/condenser microphones, compatible with wireless microphone systems and XLR microphone converters. I purchased it new in August 2024. I am selling it now because I have hardly used it. Specifications (confirmed): 48V / 5V Mic / Line Frequency Range: 500-980 MHz Number of Channels: 16 (adjustable) Channel Spacing: 0.5-2.5 MHz Frequency Response: 40 Hz - 20 kHz Operating Range: 50-80 m Operating Voltage: Built-in 3.7V / 1000mAh lithium battery Continuous Operating Time: 6-8 hours