HackRF One from Great Scott Gadgets is an open source Software Defined Radio (SDR) peripheral. Transmit or receive any radio signal from 10 MHz to 6000 MHz Half-duplex transceiver Maximum sample rate: 20 Msps quadrature samples I and Q)
Powered Tracking You Can Build Yourself - The Arduino Powered Car Tracking System uses a Arduino Uno, a GSM shield, a GPS module together with a few other parts and has been design to powered from the cars battery.
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Need an emergency recharge for you phone? Do you have a car charger handy? Or a 9 volt battery and a quarter? Then you can recharge your phone during a power outage or if you're somewhere it isn't convenient