Frustrating wireless USB doorbell - with undocumented code cancel feature

Video Description

This product somehow manages to entirely miss the point of a doorbell. To create a short and distinctive sound that alerts you to someone being at the door (or at a retail counter). Instead the unit has just two simple chimes, a longer westminster chime and then long and annoying tunes. The 30 options are:- Simple double chime. 7 x chime and "hello, welcome" spoken in seven languages. Westminster chime. 19 sections of music lasting between 10 to 15 seconds. A siren that lasts 15 seconds. The simple chime without the "hello, welcome" voice. While very annoying, the music options are quite complex and use a selection of good synthesised instruments. There are four volume options that are stepped through with the speaker button. High, medium, low and off (just flashes LEDs.) To pair a keyfob, select the desired chime with the "musical note" button, then press and hold the speaker button until you hear a quiet beep. Press the button on your remote, and the unit will store it and play that chime each time it's pressed. About 16 different buttons can be added with the same or different chimes by going through the same pairing procedure. After the limit of pairable codes has been reached, the previous codes get deleted as new ones are added. I don't recommend testing this to the limit, as my unit started behaving oddly to new codes even after going through the deletion procedure. To delete all paired buttons you hold the speaker button down continuously until the LEDs start flashing and then release it. This feature is not documented in the instructions. The transmitters are EV1527 based, so very common. It also means that you could potentially use a multi-way wall mounting remote to activate several different chimes for different individuals. The unit can also be programmed to trigger from a simple fixed-code keyfob button (not your car's fob) for summoning assistance. It's possible to pair a wireless PIR sensor to trigger a chime or siren. I found the best way to do it was to cover the sensor so it couldn't detect anything, then put the doorbell unit into pairing mode and then uncover and trigger the sensor so it sent its code. Quiescent current of the unit in standby is about 11mA (55mW). If you enjoy my videos, you can help support the channel with a dollar or two for coffee, cookies and gadgets, and keep it independent from the quirks of the YouTube algorithm by supporting me on Patreon. This also lets me link to my content on other platforms if YouTube uses the ban-hammer (again!) I release content for critique and feedback on Patreon as soon as it has been made. https://www.patreon.com/bigclive Alternatively, for a single contribution you can use PayPal:- https://www.paypal.com/paypalme/bigclive #ElectronicsCreators