O/a 4.781 porm 0.125 in. Lg; oper pwr rqmt dc 28v; m55 to p71 degrees c oper temp range; 200 hz porm 10 pct to 300 hz porm 10 pct audio range; 2 min /on/ and 8 min /off/ sig dy range cycle; 4 to 6 hz porm 10 pct interruption rate; hermetically sealed; 1 connector receptacle type terminal cannon elec co p/n gs02-16s1p001; hole mtd type 4 0.173 in. Diameter mtg holes on 2.5 by 2.125 in. Mtg ctr