Product dimension (L*W*H CM): 14.5*14.6*5.3
Inner packs dimension (L*W*H CM): 17.4*15.4*7.4

It is used as disconnection alarm in music teaching, PE, physics and students’ extra-curriculum activities, with supply voltage: 220V±10%, 50HZ；audio output power: 0.5W；output amplitude: 0-4V and tempo: 10-290 time/min.