JR28-R-D

JR 30mm Stack Lights with Sound Mallory Sonalert JR 30mm Stack Lights with Sound are small enough to fit on top of control boxes and are available in one to three stacks. Mallory Sonalert JR 30mm Stack Lights offer 9-16V DC or 24V AC/DC voltage ranges and red, yellow, and green colors. The series features seven different sound types: continuous tone, chime tone, fast pulse tone, fast double pulse tone, slow double pulse tone, medium pulse tone, and slow pulse tone. These stack lights are are cUL approved and NEMA 12 and IP52 rated.