Two Series of piezo panel-mount indicators are available with UL approval certification. Available in two series, KPE-820 and KPE-850, the units are suitable for medical, military, security, transportation, industrial control, alarm, and automotive design application where the UL approval is intended to provide an extra safety margin for those uses.

The operating specifications include operating voltage ranging from 6-250 Vdc @ 2-28MA within a frequency range of from 1900-2800(500 Hz. The units feature a sound pressure level of 75-95 dB @ 60 CM.