Powered by your car's battery, this system from GM lets you summon emergency help
But 
suppliers of electronics and technology (including batteries) will benefit from ... as 
automatic braking systems, collision protection, and emergency assistance, but ... 
You may also need to accelerate your own internal management... [DOC] [TLE] OnStar - ConsumerAffairs.com [PAR] For one thing, OnStar will let the renter unlock the doors of