niceEshop(TM) Dual Wireless Cordless Microphone System with SHURE Wireless UT4 Type +2 MIC (US Plug) Microphone element: Unidirectional dynamic microphone Current consumption: About 25mA.Battery life: Over 8 hours continuous operation Professional wireless system with 2 microphones. Ideal for professional use at any events Power supply: AC 110V or 220V .Receiving sensitivity:60dB S/N ratio. Karaoke, sound source recording and amplifying, vocal concerts, musical and opera, church, school, hall, family, party, etc.