The YN MageTech YNEM212 two-way motorcycle alarm system protects your bike with advanced security features. A built-in LCD pager display shows the status on the easy-to-use remote transmitter, which has a rechargeable battery for long-lasting power. The alarm fits for most DC12V motorcycle bikes on the market. Important notice before purchasing: AAA battery is not include, please remember to buy a new pair of AAA battery once you received it. The transmitter/remote is only rechargeable when working with rechargeable AAA battery. We do not provide installation service and sincerely recommend you to install it by a professional motorcycle alarm installer if possible. English user manual and wire diagram is available for review upon request. Remote working distance: Remote working distance is up to 800 meters or more in wild space, actual working distance may shorter.