I'm newer to the home automation movement than some, so reading reviews about all these products, you'd think that you're in for a harrowing experience of ""hit or miss"" with these types of devices. I decided to go with the Iris Contact Sensor since the reviews were pretty solid for a sensor more reasonably priced than others. Not to mention it was ""Amazon's Choice"" as well.My plan was simple.get an open-close sensor to use on our pantry door so that when the pantry was opened, the ""smart bulb"" would turn on, and then turn off when the door was shut! A refrigerator concept, just without the refrigeration! I also did not want it to be visible as these devices all just seem gaudy when they are in plain sight. I chose this option in lieu of an ""in door"" type sensor where I would have to drill holes and such. I decided I wanted to try and mount the sensor and magnet on the inside of the pantry door and hope that Smartthings could still detect it and it would operate consistently.The sensor itself is not huge or overly bulky, but they are large enough that they are very noticeable if you put them in plain sight. The setup to Smartthings connection was native, and had no issues pairing it to the hub. Renamed the device to ""Pantry"" and did some testing to understand the magnet the best I could.Keep in mind the mounting of the magnet would not be traditional as if it were on the outside of the door frame. I needed to have it mounted slightly different (Pictures included). At any rate, closed myself inside the pantry with the sensor and phone, and practiced the action of opening and closing the sensor to insure that the hub could still see it and register the action. No problems! So I completed the mounting of the sensor and magnet on the odd angle (Sensor on door, Magnet on frame). Connected my Smart Bulb (Sengled A19 Bulb).And now I have exactly what I want! A more inconspicuous sensor mounting that turns the light on and off in the pantry when the door is open and shut (Sensor Mounting Configuration Pictures Included).I honestly don't have any complaints about this sensor thus far! Love it!Also loved how I could use the double sided tape on the sensor and magnet for mounting instead of screws. Additionally the fact that I can change the battery when it's time is great! Didn't want to drop the money to only have to throw away the device later because the battery was proprietary. I will stick with this open-close sensor in the future as I build up my home automation device collection! Get this sensor! It did the trick!