ROUND VIBRATING TYPE; 4 INCH WIDTH X 2.125 INCH DEPTH X 4 INCH HEIGHT SIZE; GRAY COLOR; UL, CUL, CSA, FM APPROVAL; INDUSTRIAL APPLICATION; 120 VOLT AC VOLTAGE RATING; FLUSH MOUNTING; NEMA 3R ENCLOSURE; 0.08 AMP CURRENT RATING; VIBRATONE[R] BRAND; 500 MODEL