The CSS-05 series buzzers come in 5 mm x 5 mm SMT packages. Relying on magnetic technology, the components operate on 3V and at a frequency of 4 kHz. Sound pressure level options range from 75 dB to 78 dB with an operating temperature range of -30°C to +70°C. Prices start at $1.44 each/1,000. CUI INC., Tualatin, OR. (800) 275-4899.