uxcell ZMQ-2729 AC 110/220V Industrial Continuous Sound Electronic Buzzer Product Name : Electronic Buzzer;Model No. : ZMQ-2729;Sound-making Type : Continuous Sound Rated Voltage : AC 110/220V;Sound Pressure : more than 80dB;Operating Temperature : -20C to +45C Body Diameter : 30mm / 1.2";Overall Size : 61 x 30 x 28.5mm / 2.4" x 1.2" x 1.1"(L*W*H);Mounting Hole Diameter : 3.5mm / 0.138" Wire Length : 20cm / 7.9";External Material : Plastic;Color : Black, Green Weight : 16g;Package Content : 1 x Electronic Buzzer