The CIS4/45 is a 2-gang, vandal resistant intercom call-in station with integrated speaker/microphone consisting of a 2.5" square frame loudspeaker with a 2.35 oz. ceramic magnet and a phenolic impregnated, moisture resistant cone. It is equipped with an 45 Ohm loudspeaker and a momentary contact (normally open), push-to-call, switch. Three (3) interwoven, steel security screens are mounted between the 12 guage, brushed stainless steel faceplate and loudspeaker. Tamper resistant, #6-32 x 1" , 'pin-in-torx' screws are included.