1. GPS for Smart Keys. So, that with your cell phone GPS you can track down your Smart Key, or if your smart key is in your car you can display a GPS on your car screen that will show where your phone is.
2. An physical Smart Key (or cell phone key see #3) expansion that can be used as a weapon for stabbing. For example, I visit homes where I don't always know where I'm going and can be around unsafe people, or in unsafe places, such that I might need a ready-weapon. It is suggested was suggested in my MA state HMK training modules that I carry a car key protruding from a relaxed fist in case I need to make a fist with it and use it as a weapon for dealing in unsafe areas. So, a Smart Key is still Smart because an you shouldn't need have to place a key in the ignition and turn it to turn a car on, but having a ready key-like weapon available can sometimes make a lot of sense that you can easily fit in the palm of your hand.
3. Ultimately, a three in one would be best, where you phone is your Smart Key with a weapon. And, your car can be unlocked by a code if you don't have your cell phone, or have lost it, such that you can use your car's GPS to find your cell phone.
4. A residential GPS to determine where items in your house or property are with GPS units.
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