Item #: RTS2

Multi-Signaling Accessory Key No Strobe 20-29vdc power;sounder = 85 dBA at ten feet;4.8w x 5.3h x 1.6d;compatible only with D4120/D4P120/D4120W INCLUDES KEY You can add the AOS Add on strobe

Item #: RTS2-AOS

Multi-Signaling Accessory With Strobe Same as RTS2 with add on strobe; compatible only with D4120/D4P120/D4120W SYSTEM SENSOR