Wide application: these loud bike alarms can be widely applied in various kinds of vehicles, such as bicycles, motorcycles, electric bikes, electric scooters, mountain bikes, sightseeing vehicles and so on; And they're also practical for home use, you can attach them to a door or window, to remind you when someone opens the door or window<br>Convenient to install: the waterproof alarm system is equipped with a double-sided sticker and strap, giving you multiple choices, so you can install it by pasting or tieing, no other installation tools are required, and the simple and quick operation process will not take up much time and effort<br>Package includes: there are 2 sets of wireless bike alarms with remotes and 6 pieces of battery in the package, adequate quantity can meet your daily use and replacement demands, which can replace your old one or broken one, and you can share with your friends, colleagues, relatives and more<br>Quality material: this security motorcycle alarm is mainly made of reliable PC, sturdy and solid, will not break or deform easily, can serve you for a long time, the surface and edge are smooth to touch, exquisite workmanship makes it no burr, do not worry it will scratch your bicycles or hands, with a certain waterproof ability<br>Adjustable sensitivity: these black vibration motion sensors are designed with 7 different levels of sensitivity, you can easily adjust them according to your actual demands, each level can respond to strokes of varying strength, from gently touch to push or beat, and they have a wide range of remote controls