Digital Keypad (490-0452) Features Faxback Doc. # 17360 The Radio Shack Digital Keypad is a high quality, UL-listed security keypad that connects to the following Radio Shack security systems. 8-Zone Security System - Cat. No. 49-485 2-Zone Security System - Cat. No. 49-451 It provides additional remote locations for disarming and arming the system, and for programming access code numbers. This keypad's features include: Arm and Loop Indicators - show the alarm system's status. Panic Circuit - lets you quickly trigger the alarm from the keypad. Supervised Keypad Circuit - communicates with the main panel and sounds the alarm if someone tries to remove the keypad. Selectable Keypad Address - lets you add additional keypads for extra convenience. This product is UL listed under Standard Number 1023, "Household Burglar- Alarm System Units." Use only with UL-Listed security devise.