Are you looking for a cheap wireless doorbell? The Boomile wireless doorbell is perfect for you. It has a range of 1000 feet. It's easy to setup and begin ringing. No wires are involved. Simply stick on the door frame and plug into the wall!
I am impressed by this doorbell. I got this for my father because he is hearing is bad and sometimes he does not know when someone is at the door. I was worried that it would not be loud enough for him, but I was wrong. It can get loud. On the side of the plugin, it has a volume button for you to change the volume from low to high.
The doorbell can play 36 different tones and songs. To chose one, you must click the button on the left. It flashes blue when the tones are being played.
The button comes with a battery, 3M adhesive, and a flat-head screwdriver (I didn't need to use it to open the back. It basically pops off.). I am not sure how long the battery will last. I would recommend picking up a name-brand 23A 12V battery for it to be safe. I always have lasting issues with off brand batteries. Here is a 4-pack of Energizers.
I am glad they included the 3M adhesive stick on. 3M is one of the best brands. After I stuck the button on the wall outside, it did not budge. It's sturdy and should last a long time.
Disclaimer: I received one or more of the above to facilitate this review. Regardless, I only recommend products or services I use personally and believe will be good for my readers. All opinions are 100% my own.