$PSID's E-N-G Mobile Systems is a wholly-owned subsidiary of PositiveID Corporation. PSID is a life sciences company specializing in biological detection and diagnostics systems. E-N-G operates in a 12,000 sq.ft. headquarters facility in Concord, CA. This building includes a 2,000 sq. ft. modern office block, a large assembly area, cabinet shop, spray booth, metal shop with fabrication and welding facilities, and parts warehousing space. E-N-G also has a service and integration facility in West Grove, PA and an Approved Service Center in Chicago, IL. ~ http://www.e-n-g.com/about