G20 GSM car alarm has all the functions of general car alarm. Beside, it has its own remarkable features like remote engine cut off，and alarm to mobile. It realizes the integration of mobile alarm through the configured SIM card of GSM networks, and it has been very convenient to install and to use.

G21A Upgraded central lock GSM car alarm is specially designed for cars with central lock. Interactive functions like anti-theft identification, remote control, are added based on general alarm functions. Using cars' original remote controller， G21A secures your car well after simple settings.

G21B Upgraded Prototype GSM Car Alarm is specially designed for cars with inbuilt alarm. It's compatible with inbuilt alarm and operates simultaneously with the inbuilt alarm. Interactive functions like anti-theft identification, remote control, are added based on general alarm functions.