A system (10) is disclosed for maintaining security and data gathering for a number of vehicles. The system (10) includes a vehicle activity module (12) for each of the vehicles (2), the vehicle activity module (12) including a wireless transmitter (18), at least one ID reader (50), and activity sensors...http://www.google.com.hk/patents/US7340400?utm_source=gb-gplus-share專利 US7340400 - Vehicle activity module
