Data Chip Reader - Single-Door â— Indoor â— Flush mount â— One 12VDC green and one 12VDC red LED â— Standard single-gang aluminum plate with classic Corby logo â— Annodized scuff and scratch resistant finish â— Long lasting read head with 12" (304mm) leads â— 74-4345 circuit board for 17 users included â— One relay output â— Use with 33-4320 and 33-4321 data chips only â— Supports request-to-exit â— 12VDC â— Reader: 2.75" W x 4.5" L x 1" Deep (70 mm x 114mm x 25mm), Circuit board: 1.6" W x 2.5" L x 1.25" H (41 mm x 64mm x 32mm)