These probably won't work for you because of the 2 miles distance requirement (but they might since their advertised range is around 3.5 miles). However they are cool as hell:
http://www.amazon.com/Fashionable-Wristwatch-Watch-Auto-Scan-LCD-display-Auto/dp/B002AAH8NU/ref=sr_1_6?ie=UTF8&s=electronics&qid=1277331453&sr=8-6I just propogated last night...