Review on SECRUI Wireless Doorbell: Waterproof Mini Doorbell with 1,000ft Range, 5 Volume Levels, Mute Mode, LED Flashing - Black by Kyle Collins

I bought this for my two bedroom apartment. I assumed I would have to install the application, connect to my wifi, etc. However, this is not required. All I had to do was plug the receiver into an outlet. The package contains two screws and two adhesive pads. I used my own double sided tape, not realizing there were sticky pads in the box too. This little doorbell looks pretty elegant. It is black and has a multi-colored LED in the shape of a doorbell that flashes when the doorbell is pressed. It's small enough not to cover the second slot if you have a two-slot panel. It's quite loud and has a volume control. But even at maximum volume I couldn't hear when the shower was working with the handset in the other room. However, I think you can buy multiple receivers to solve this problem. For the price I think this is a great product!