GE 51107 Smart Home Wireless Alarm System Kit for $19.97 shipped. Here is a screenshot for your reference. Alternatively, it is available at Amazon for $19.97 with free shipping on orders over $25. This alarm kit features a door alarm with a four-digit keypad for entering a custom code, 3 window alarms that requires no wires or drilling with 120-dB alarms for warning. Most places have this GE 51107 Smart Home Wireless Alarm System Kit for about $35.