AUDEW PRO Dual WIRELESS CORDLESS MICROPHONE SYSTEM WITH WIRELESS UT4 TYPE +2 MIC Professional wireless system with 2 microphones. Ideal for professional use at any events Power supply: AC 110V / 220V (&plusmn;10%).Dimensions: 420 x 240 x 45mm (L x W x H) Current consumption: About 25mA.Battery life: Over 8 hours continuous operation Power supply: AC 110V or 220V .Receiving sensitivity:60dB S/N ratio. Karaoke, sound source recording and amplifying, vocal concerts, live-performances, conference, musical and opera, church, school, hall, family, party, etc.