Wireless Microphone System Receiver with Cordless Handheld Mic V-Band Noise Reduction for Home Cinemas Karaoke Church Speech Wedding Party Singing Wireless Microphone 80m/262ft Long Transmission Distance Frequency: Fixed frequency (Channel A: 224.3MHz, Channel B: 242.2MHz, Channel C: 227.6MHz, Channel D: 246.3MHz) Frequency Stability: ± 0.005% Dynamic Range: 100 decibels Maximum Deviation: ± 45kHz AF Response: 80Hz-15kHz (± 3db) Total Signal-to-noise Ratio: 105db Overall Distortion: ≤ 0.8% Receiver Sensitivity: 12dBuV (80dBS/N) Total Harmonic Distortion:<0.3% (at 1kHz) Harmonic Interference: ≥ 50db Mirror Interference: ≥ 60db Transmission Power: 10 MW AI high power, 3 MW low power Working Environment Temperature: -10 ℃~+40 ℃ Transmission Distance: 80m/262ft Receiver Power Supply: EU Plug, US Plug (optional) Microphone Power Supply: uses 2 * AA batteries (but batteries are not included in this product) Receiver Size: 22 * 17.5 * 5cm/8.7 * 6.9 * 2-inch Microphone Size: 24.5 * 5cm/9.6 * 2-inch