We found some clearance alarms at a few of our local lowes,wm and menards,we always look at clearance stuff to find something useful,these were a pull string type that I attached to our windows and back door around the doorknob and with small eyehooks.they are loud and invisible from outside the house,very noisy and take 1 aa battery.just dont forget to unhook them when you open a door or window at night.I have not forgot to do that after the first few times.between them and our dog I will have enough time to get to my firearm.we do not have a dedicated alarm system,the last home we did that at our insurance went up because it was called an improvement.