Microcomputers are widely used for microwave 
ovens, air conditioners, cars, toys, timers, and other
alarm equipment. Externally driven piezoelectric 
sounders are used in digital watches, electronic 
calculators, telephones and other equipment. They are 
driven by a signal (ex.: 2048Hz or 4096Hz) from an LSI 
and provide melodious sound.

Features
1. Low power consumption
2. No contacts therefore, no noise and highly reliable

Applications
1. Telephone ringers
2. Various office equipment such as PPCs, printers and 
    keyboards
3. Various home appliances such as microwave ovens
4. Confirmation sound of various audio equipment