QSR-3010B Active Buzzers - Black (12V / 10 PCS)
Model: QSR-4310B - Color: Black - Material: ABS + copper - Rated voltage: 12V - Max. Enable voltage: 30V - Max. rated current: 3.5mA at 12V 2.8KHz - Sound pressure level: 85dB at 12V 2.8KHz (minimum) - Resonant frequency: 2.8 +/- 0.5KHz - Working temperature: -20~60'C - Cable length: 4cm - Perfect for DIY project - Comes with 10 pieces per pack Datasheet: http://m5.img.dxcdn.com/CDDriver/CD/sku.157476.doc