Broan-NuTone LA600WH Universal Wired/Wireless MP3 Doorbell Mechanism White, 2.25" x 6" x 9.5"

I bought this unit because it is the only one I could find that could use custom .mp3 files. Some of the other reviews discussed volume level. This unit has a small speaker, it is powered by (3) D batteries. It has three volume levels. The highest setting works about as good as you're going to get out of the speaker. In addition, as mentioned in other reviews the cover does reduce the volume about 10% to 20%. I didn't find it to be a problem. The doorbell transformer serves to trigger the unit and light the door bell switches if you have them. Be sure to use the diode and follow the directions on the wiring.The unit includes a USB cable and you can plug it into your computer and download just about any .mp3 file you want to it. There is about 100 megs. of memory so you can put about 15 full length .mp3 songs on it. There are plenty of software programs out there to customize your music, sounds, or whatever you want. I used a popular program that starts with A, with the program you can edit for length, effect, etc. Just a note. The unit lets you toggle through four different play lengths of up to 20 seconds. or the whole song. When you preview on the unit with the selection for the whole song it will only play about 30 seconds; however, the full song will play if the button is pushed.The unit plays voice pretty good so don't feel like you are limited to basic melodies or bells. I installed a selection of songs that I like. Plus, you can change up the line up for the holidays. You can select different songs for front and back door. Or in my case front door, and an i/r beam I put up at my front gate to let me know when people drive on the property.Bottom line there isn't another unit out there that will let you do what this one does. My wife loves it!!

I removed the jumpers for the wireless chime and it kept ringing at all times, removed the actual antenna from the motherboard and it kept ringing. It's jut not worth it. It also never worked directly attached to the cables since it's wired, it should've worked. I had to put batteries on it. I took it out and put the old one and it works fine again. Will purchase another one though because mine doesn't work well with the Ubiquiti doorbell. it "half" rings, but I prefer it to this one going off all the time. Also, if you have the Ubiquiti G4 doorbell, the cables that come with the camera to install on the chime don't fit in the area that this chime box has for cables, You have to connect actual wires in this one. The Ubiquiti camera comes with an adapter for screws. I had to strip electric cables from somewhere else to make an actual connection here. I have no idea why Ubiquiti says that this works with their doorbell when it clearly doesn't. Waste of time and money. Bought it for around $50 and will now buy a $20 one.

Seems very good all around, but I have some thoughts about the install. The unit works either with wireless buttons (not included, purchase separately) on batteries (D size), or wired. If you are using it wired, it requires installing a diode (included) across your doorbell pushbutton (existing or separately purchased). You must have a 16VAC (not DC or other voltages) doorbell system for this to work. The diode allows half-wave power to reach the LA600WH, powering its logic circuits; pushing the doorbell button bypasses the diode, delivering full-wave power, which the logic circuit detects and causes the unit to play whatever sound is programmed. I happen to have a three-level home, with door chime units on each level, wired in parallel, so the front door button rings all three chime units at once, so you can hear the doorbell clearly on every level. I was going to install this unit on the main level for better appearance and more sound choices, but the diode requirement causes the other door chimes on the circuit to be powered at all times, which would quickly lead to their over-heating and failure. My only alternative is to go to the wireless configuration, which I can't/won't, because the other chime units aren't wireless and replacing them with two more of these units seems a waste of money.I'm a techie, so I can engineer a workaround, but if you're not, understand that this unit is really built for the three simplest configurations of door chimes in your home: (1) wireless pushbutton(s) with this unit in wireless mode running on batteries (requiring periodic replacement); (2) one pushbutton hard wired to this one chime unit alone; (3) two pushbuttons, one for the front door and one for another (rear? side? diode goes only on front door button) door, hard wired to this one chime unit alone.Also, because of the diode requirement, the install is a little bit (just a little) more complicated than just hooking the thing up where your old unit may have been--read and follow the directions carefully. The diode provided (1N4002) is probably adequate, but be aware that if the chime stops working (or sounds continuously), the diode is a likely point of failure and you'll need to source a replacement (DigiKey, Jameco, etc.). If you have a lighted pushbutton, it will be less bright because of the diode.Sorry if this is a little complicated. I think it's a fine product that will work for most people, I just happen to have an unusual installation case that will take a little more work. I wish NuTone had provided a contact closure while sound was playing, as this would make even my odd install easy to handle with this device.