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Pros: Very loud. Easy to install. Remote key fob has excellent range and covers a 3000 ft house with no problem. You can program up to 50 alarms off of one remote. I have only done 3 alarms and they work great. Cons: Instructions are confusing. The Chinese are trying but they need some help with their translations. So I'll help. Below is how you program multiple alarms to one or more remotes key fobs. Model SF06R 1) Remove one battery in other alarms that are already paired with the key fob. You must do this or you will deprogram them from the key fob. 2) Insert only one battery in the new alarm. 3) Press and hold the Bell button on the key fob. 4) Insert 2nd Battery into the alarm while holding the Bell button. The Alarm will beep once. Continue holding the Bell key until the alarm beeps one more time. This takes a few seconds. 5) Release the bell key and press the unlock button. The Alarm will beep again. 6) Test the key fop by pressing the bell button. The alarm should ring. 7) Reinsert all batteries in the other alarms. 8) Test all the alarms by pressing the Bell button. All Alarms should ring. 9) Repeat steps 1 thru 8 for any additional key fobs. This only took me an hour to figure out. I thought I'd save everyone some time. So print it out for any future use. May you all have a safe home! If you thought this helpful please give this a "helpful" vote so others will see these directions. Thanks.