The iRad100 is a very inexpensive way to equip yourself with a high quality radar detector. I have found it responsive, accurate and easy to operate. Since it uses the iPhone as a display, you have to find a place to set up or mount the iPhone. My car has a recessed instrument panel, so I simply set my iPhone in position in front of my speedometer. The iRad has its own speedometer display which uses the iPhone's GPS to determine your rate of travel.
Operation of the iRad100 in conjunction with your iPhone draws a lot of power from the iPhone, so on trips of any length, you will need to use your iPhone's USB cord which can be piggy-backed onto the iRad's cigar lighter plug. This creates an extra step in getting it ready to use, but I find the extra information it provides (such as known speed traps) is worth the trouble. And the iRad100 can be used without connecting it to the iPhone. Its audible radar warning noises are supplemented by voice warnings (e.g. "K alert"). (My girlfriend's name is Kay, so she asked me "How does it know I'm here?)
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