FC-31 DC 12V 85dB Normal Open Buzzer Alarm Time Delay Module Blue Product Name : Alarm Delay Module;Model : FC-31;Rating Voltage : DC 12V Buzzer Level : 85dB;Frequency : 2300Hz;Type : Normal Open Trigger Fixing Hole Dia : 3mm/0.12";Fixing Hole Center Distance : 51.5 x 24.5mm/2" x 1"(L*W);Overall Size : 56.5 x 29.5 x 12mm/2.2" x 1.2" x 0.47"(L*W*H) Materials : Metal, Plastic, Electric Parts;Main Color : Blue Weight : 14g;Package Content : 1 x Alarm Delay Module