Ringer Extension Material Metal Overall Depth 3 5/8 in Overall Height 5 1/8 in Overall Width 4 1/2 in Compatible with Grainger Part Number Not Applicable Compatible with Series Not Applicable Resistance Properties Electrically Insulated Features Activated by Ringing Voltage CSA Certified Type 1 Enclosure Color Gray Product Type Telephone Extension Horn Ringer Device For Use With Analog Telephone Includes Horn 100dB @ 10 ft Manufacturers Warranty Length 5 yr