STEP 1. How many door/window sensors do you need? - Include all entry doors and windows. - Don't forget any fire escapes, cellar entrances as well as windows above the first floor (A ladder and a rope provide easy access to high windows). - For rooms with more than 3 windows instead of window sensors use a motion detectorto reduce cost. STEP 2. How many motion detectors do you need? STEP 3. Or pet-friendly motion detectors? STEP 4. How many door keypads do you need? STEP 5. How many keyfobs do you need? STEP 6. How many smoke detectors do you need? STEP 7. Do you need carbon monoxide sensors ? STEP 8. How many wireless panic buttons do you need?