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This is a super simple bike alarm, which takes less than 30 seconds to fit to your bike. It runs on AAA batteries (included), which are rated for 6 months on standby.
If the bike is moved, it'll set off a warning, and if it's moved again the 113dB alarm will sound.
There are a couple of limitations compared to more premium options. There's no GPS tracking - if you're looking for that feature, you'll want the Knog Scout (iPhone only) or Bosch ConnectModule (Smart System only). It's also not vandal proof (it attaches with cable ties).
It's IP55 waterproof, so you don't have to worry about the weather.