Door Alarm Time Delay 9-12 Vdc Electronic Circuit Kit: MXA077

Great alarm, I used this for a walk in cooler because my employees would always leave the door open behind them. I used it more as a an "educational" alarm so I set it at the lowest time setting so it could sound the moment they walked away and if they left the door open they would have to go back and close it, and so far it has worked.What I did was install it inside a gang box and wire it to a 12v power supply I had from an old router, in one of the pictures I show the wires of the power supply, the ones that have white marks will usually always be the positive wire and the negative wire usually has no marks on it.What I did to make the alarm sound louder was to take the QC "Quality Control" sticker around the little speaker and covered the small hole on the top of the speaker, see pictures, and it did a huge difference. I also found that taking the time and adjusting the speed and tone was crucial to making it sound the loudest. I also drilled some not so perfect holes in the front of the gang box cover so the sound could be heard better. Finally I macgyvered it onto our walk in cooler door and the alarm worked great.I will update my review if I run into any premature problems

Unfortunately I Purchased this alarm a little over 2 years ago and just getting it installed on refrigerator door. It took quite a bit of time trying to make it work. The delay timer eventually started working after multiple attempts of rebooting etc. I unplugged the jumper wire to bypass timer. That worked!! Amazing! But I wanted a delay😡After several more minutes, and jumper reconnected, fortunately the delay timer started working. But would only work on the lowest alarm Delay setting at 25 seconds or so. I gave up! 25 seconds is better than nothing. Don't know if it's worth my time to get ahold of the company/sender to get a replacement. Bummer. 

It worked fine for two days. Now it beeps as soon as you open the door. Wife is not happy. Stopped using it.

The unit does not come with a battery snap connector. They are not expensive but finding a Radio Shack might be tricky. You will need to solder the battery connection adapter (9 volt) onto the circuit board. This gave me an excuse to buy a soldering gun and learn how to use it; thank goodness for YouTube. The unit does not come with any type of housing to put the battery and circuit board inside so I purchased a project box from Radio Shack for $10. It is over sized but I felt the need to put it in some type of protective housing. I set the alarm delay for 10 seconds, the shortest available. My kids don't care about the cost of heating and cooling the house so the door to the garage would sometimes get left open. This alarm sounds anytime the door is left ajar. It works perfectly. Here is a picture of the project box and the magnetic switch.

Does what its supposed to however the timing seems to be out of whack a bit. On the low end it goes off after 20 seconds, which should be 10 - on the high end it says 160 seconds, after 3.5 minutes I just reset the thing (I need it on the low end anyway so the high end didn't really matter to me).Really wish it would go the whole way down to 10 seconds, as 20 is slightly to long.

This product is good for someone who knows how to solder. You will need to solder the battery connection (3 for $2 at radioshack) adapter onto the circuit board. After that you will need to find a way to house the board so that it doesn't mistakenly get damaged at the site of installation.Overall, this works perfect for our purposes. The longest delay time is about 2:30 minutes. I installed this on a freezer on the bottom because the sides and top have the gasket which is too wide for the magnetic switch to work. By being on the bottom, you can hide the circuit board and battery behind the bottom grill of freezer. I screwed the wired switch to the plastic grill and used doublesided tape to attach the other magnet to the bottom of the door.There are options with this time delay door alarm to adjust the delay time, pitch, and repetition rate of the alarm sound.Works perfectly.

This is EXACTLY what we needed for our fridge. I took a 12v ac adapter and soldered it on so I don't use batteries. I just plugged it in and that's it!. Works Perfect. I have it set to about 30-35 seconds before the alarm goes off. Just enough time for my kids to get in and out. This keeps them from standing in front of the fridge with the door opened. It's caught the fridge from being completely closed many times already and it's awesome!I soldered long wires on the magnetic contact side so the board sits on top of my cabinets and run on top of the fridge. The power side also has a long wire as well so it can plug into the plug where the microwave is plugged into.Instructions were great. Shipped fairly quickly. I think it only took two weeks from Thailand (I think) but it was worth it.

I used this board for a gun safe to prevent forgetting the door open. I used a small cylindrical magnet to replace the sensor magnet that came with the unit because I did not like the size of it. My only problem with it is that I would prefer a more "pleasant" chime than the tone it makes but other than that, it worked great.In this case the safe had plenty of room in the battery compartment and I just used double sided tape to mount it. The safe is a Gunvault GV2000S ( Gunvault GV2000S Multi Vault Standard Gun Safe ). The safe uses a 9V battery to operate and it was annoying that I had to change the battery every couple of months so I added a voltage regulator (7809) and wired it in a way that both the alarm and the safe are powered by a 12V power supply and if I remove the plug from the jack, both the alarm and the safe are powered by the 9V battery. I attached some pictures showing how the whole thing was put together.