As the latest accessory to leverage low-power Bluetooth 4/Smart wireless technology, Kensington's Proximo Starter Kit ($60, aka Fob & Tag Kit) is a proximity monitoring system marketed towards iPhone 4S and iPhone 5 users. Proximo consists of two primary pieces -- a keychain fob and a separate tag -- plus one watch-sized battery for each unit, and a screwdriver to make battery insertion and replacement easy. You put the batteries into the units,…
