Waterproof Piezoelectric Ceramic Buzzers with High SPL at 3.5kHz Key Specifications/Special Features Buzzer type: piezoelectric ceramic transducer Tone nature: continuous Operating voltage: 12V Rated voltage: 12V Rated current: 10mA Rated frequency: 3500 +/-500Hz Application: Gas and burglar alarms Home appliances: air conditioners, microwave ovens and various types of microcomputer-controlled home electronic appliances Automobile speed alarms, navigators, car stereos and other automobile equipment Toys, games and other simple electronic devices such as teaching aids Medical equipment Typewriters, word processors, compact disks