Hisonic HSU288 Dual UHF True Diversity 200-Ch Wireless Microphone System with Automatic Frequency Pairing True diversity dual 200-ch microphone system, 100 channels per microphone Easy and convenient automatic frequency pairing Ideal for stage performance, school plays, church activies and etc Long range transmission, up to 300 feet line of sight 30-day money back guarantee & 1-year manufacturer's warranty