Feature:Material: ABSColor: BlackSize: 9 x 11.8 mm (L x D) / 0.35 x 0.46 inchRated voltage: 5VOperating voltage: 4-8VRated current (MAX): 30 mAMin sound output at 10cm: 85 dBResonant frequency: 2300300 HzOperating temperature: -27 to +70 CStorage temperature: -30 to +105 CPackage included:20 x Active buzzer continuous beep