The wireless microphone is lightweight , can be used for families, lectures, dance halls and other places of entertainment. BK-633 Frequency Range :740MHz--820MHzBandwidth: 30MHzModulation Type: FMAudio Response :40-16000hzDynamic Range:> 105dbBAudio processing mode: Dynamic Compression Extension TechnologyOperating temperature: 0c to 50c Better quality KaraokeWireless microphone(BK-633)