DIY Project DC3-24V Continuous Sound Electronic Alarm Buzzer 23mm 3Pcs Product Name : PiezoBuzzer Sounder;Voltage : DC3-24V Type : Continuous Sound;Total Size(Pin Not Included) : 23 x 10mm/ 0.9"x 0.4"(D*H) Cable Length : 11cm/ 4.3";Hole Dia : 3mm/ 0.11" Materials : Plastic, Metal;Main Color : Balck TotalWeight : 12g;Package Content : 3 x PiezoBuzzer Sounder