SPECIFICATIONS :
Size:  2.193"W x 2.350"H x 5.50"L
Weight:  .5 lbs. 
Lighting:  27.5 or 5 volts DC
Temperature Range:  -20C to +55C 
TSO Compliance:  C37b and C38b
Environmental Cat.:  AIDI/A/KPS/XXXXXXZXA/AB/A 
Design:  All solid-state, single chip microprocessor controlled with gas discharge display and Electrically Alterable Read Only Memory (EAROM) for power-off frequency storage.
Duty Cycle:  Continuous