The Backcountry Patrol AP 30 Kit offers a fully electronic, innovative system that's one of the lightest on the market. Since the airbag doesn't require a cartridge, it can be deployed multiple times, allowing you to practice at home without having to buy a replacement cartridge every time you deploy. The trigger and deflation release are mechanical, eliminating the possibility of malfunctions due to electronic issues, and the 2 AA batteries that power the fan are unaffected by extreme cold, thus making the bag's performance extremely reliable.