DeWalt MobileLock DS500 is a wireless alarm system combining GPS locating ability with alarm monitoring and notification. Contained within a weatherproof box, the unit has 30 days of run time without external antennas or plug-ins required. It is controlled through a website portal and phone menu system and communicates via digital cellular communications on the Sprint PCS network. Estimated list price: $500 to $600 for hardware; $20 to $30 for the monthly service.