Being small, palm-sized, the monitor can easily be attached to such items as a drawer to monitor when the drawer...http://www.google.co.uk/patents/US4797663?utm_source=gb-gplus-sharePatent US4797663 - Portable security monitor and time recordingAdvanced Patent SearchPublication numberUS4797663 APublication typeGrantApplication numberUS 07/025,174Publication date10 Jan 1989Filing date12 Mar 1987Pri