WSDCAM 113dB Anti-Theft Bike Alarm with Mount and Remote

Recently someone tried to cut through my u-lock and steal my electric bike. It was a failed attempt but it made me realize I need an alarm system for my bike. I ordered this and got it on time. Comes with everything you need to install it. I chose zip ties to put it under the baby carrier attached to my bike. Its very loud and will definitely get the attention of our neighbors and us at night. Its very sensitive also coz one time it was windy and the alarm went off. Overall its a good investment for your expensive bike.

This alarm is LOUD! A great deterrence for would-be thieves and to scare those nosy people who get all touchy with an e-bike they see.

I love this thing. Took me a bit to figure out how to adjust sensitivity, volume, etc. though it's fine just leaving the default settings. The instructions are to press the disarm button and hold it until the blue light stays lit around the arm button. I would do this, but the blue light would then go out. I finally realized that if I held it a couple seconds longer, it would stay lit and then allow me to use the adjustments. There's a good YouTube video posted by a guy that explains this alarm and how to adjust settings.
And it works! If anything jostles the bike, it gives a sharp warning tone and stops. If the jostling continues, it sounds a siren alarm. And it's LOUD at full volume.
Also features a horn sort of thing that has three possible tones that you can select.
For the price, I don't think you can beat it's value at keeping people away from your bike.
Could easily get anyone with bad intent to run like a rabbit, not to mention startling them badly.
As to mounting, the unit I got came with a clamp mount and bushing to mount to round bar or bike frame, however I decided to mount it using the included zip ties and mounted it to bike rack under my rack bag where it's essentially invisible. I taped a bit of cut up inner tube to the rack and then zip tied it to that and it holds very securely and as mentioned, is unnoticeable.
It runs on a button battery I believe, which is replaceable.
When you arm it, it plays an ascending series of notes. Then wait for a little beep which confirms it's armed. When you disarm, it plays descending notes.
The remote is plastic and looks kind of chincy with chromed buttons, but it's easy to put on key ring with my bike key and cable lock key.
I leave this alarm armed when bike is in my garage just in case. Very happy with it.