... workshop, school, factroy, museum,hospital. widely used for bank,electric power dept, oil dept,Railway Dept, financial Dept,police Depe ... and so onspecification:. working voltage: input 110VAC, Output 9VDC. siren index: 95db(test distance: 300mm, surrounding noise: 65db, standard ... alarm panel will send signal out though transimitter, when siren recived the signal will sound and light alarm wireless ...