SKP PRO AUDIO UHF-271 Dual-Channel UHF Wireless - Handheld / Headset / Lavalier / Guitar Microphones System Range 260ft (80m). open field Dual-Channel UHF Wireless Handheld / Headset / Lavalier / Guitar Carrier Frequency: 480Mhz - 600MHz Total Harmonic Distortion: less than 0.5% Frequency Response: 40hz-15khz3dB Range: 260ft. (80m) open field