OhmKat Wireless Universal Video Doorbell Chime (Patented) - For Use with Wired Nest, Blink, Ring, August, Skybell, Simplisafe, Alula & Compatible OhmKat Video Doorbell Power Supplies

This could not have been much easier to install. I have a Nest 2nd gen wired doorbell. It is hooked up to a transformer. Very standard straight wire job. I wired this Ohmkat in series. The instruction could not have been simpler for the wiring. I plugged in the ringer and that was it. I was looking for instructions on the app because everything has an app these days. No, not for this wire it in, plug it in and that’s it. It works (with a couple of seconds delay sometimes) without any other real set up. You have the option of three ringtones and volume. They really knocked it out of the park with this one.Update: Starting to have trouble with this on 21 Nov 2024. It has started ringing for no reason. No one near the door. Time to call tech support.

This review is for the Ohmkat Universal Video Doorbell Chime; not the Ohmkat Video Doorbell Power Supply. The chime is designed to work with the power supply; I have reviewed the power supply separately. This is the unit that produces the sound when the doorbell is pressed - and it does that quite well!This product has two components. The first is the transmitter, which plugs directly into the Ohmkat power supply and sends an RF signal to the chime unit, which plugs into a standard AC outlet. The only configuration required for the chime is to select the volume and the desired chime tone. I think the vendor missed an opportunity by not mentioning in the product information that it has 3 volume levels and 32 chime tones from which you can select. I think more people would be inclined to buy it if they realized that it had those selections.It has the typical ding-dong, ring, and Westminster chimes, but also quite a variety of other tones, including The Nutcracker, Jingle Bells, Beehoven's 5th (I think) and a bunch of others. Some sound quite classy. For my house, I don't think either the lower or middle volume levels will suffice. I don't think I would hear it from the bedroom or my home office. But the high volume is adequate for my situation. I think that some tones would be more easily heard than others, if I happened to be in another room from the chime.I was going to buy my own chime from the big box hardware store, but my wife particularly wanted a Westminster chime and those that I found cost almost as much as the Ohmkat and I would have had to wire them in line with the power supply and doorbell. The Ohmkat Chime is truly plug and play - just plug the transmitter in between the power supply the the cord that connects to the doorbell and plug the chime into an outlet and it's operational.My only complaint is that there is only one button to select the tone (and another for the volume) so, if you hear a tone you like and advance to see what else there is, you have to loop through all 32 tones to get back to the one you like. But, since most people will not be changing the tones frequently, I think this is only a minor inconvenience.Overall, I think this is a great purchase if you don't already have an existing doorbell and want some audible notification, other than your phone, or a Google Home device, that your doorbell has been pushed.

The only problem with this Ohmkat system is that there's no writing diagram. It took me a couple of hours to figure it out, so I hope this will save someone some time.It turns out that the type of bell doesn't really matter... The Simplisafe bell works like a regular button-- it just closes the circuit. The Ohmkat transmitter will send a signal to the wireless Ohmkat chime when the button is pushed. The wire needs to be fed with 24 V AC from the transformer. See the wiring diagram. My system had some multi- conductor phone wire going to the bell. Your colors may vary. Just look at the colors of the wires at your button and find the same ones at the legacy chime.The Ohmkat transmitter needs 20-24V AC in its power inlet. I didn't have the Ohmkat transformer, but thankfully the transformer that the old legacy chime put out 24V AC. Wire the two poles of the transformer to the power inlet side. I just cut the plugs off and spliced in some longer wires using butt connectors (see photos). Make sure you have the polarity right...I had it backwards and the transformer got really hot and the chime would work (weirdly, it also killed the 24V output of the transformer. I'm not an electrical engineer, so I can't explain it. When I swapped the wires, the transformer and chime worked properly and it didn't get hot). Test it first with some alligator clips.When I confirmed that everything worked properly, I used the frame and cover of the legacy chime to hold the Ohmkat transmitter. To make room inside, I removed the hardware and cut a big hole in the middle of the frame. I stuffed the transmitter in there and snapped the cover closed. Works well now. I hope this helps. Good luck.