7.5W*2.5Hmm 2700Hz 80dB SurfaceMount Buzzer RoteVolt 3V CoilResistance 45ohm MaxCurrentConsumption 50mA Magnetic Buzzer with passive circuitSMDApplications: Telephone, Clocks, Medical Equipment, Mobile Phone, Toys, Official Supplies, Note Computer, Microwave Ovens, Air Conditioners, Home Appliance, Automatic Controlling Devices.(7.5W*2.5Hmm 2700Hz 80dB) Magnetic Buzzer with passive circuit