Steering: Differential steered via two servos Main Processor: Basic Atom w/ 16K memory Software: BASIC Micro Atom Basic, 2000 lines code Operating Modes: Sentinel Mode, Wait mode, Wall Follow, Wander Mode, Auto mode , RC Mode Sensors: Devantech SRF-04 sonar and CdS light cell Lighting: White LED headlight with auto-on capability Sound: Piezo electric speaker for beeps. Speech: General Instrument SP0256-AL2 allophone speech processor. 39 word and phrase vocabulary spoken through 2.5" speaker Control: Lynx RF key fob and RF module Power: NITRO 7.2V rechargeable NiCad Chassis: Budget Robotics Octobot Collision Protection: Custom brass bumper The parts I got from several varied sources - Parallax, BasicMicro, Budget Robotics, Fry's, Radio Shack, Gateway Electronics, Home Depot supplied some plumbing parts, and stuff from my garage that I had for years. One of the toughest problems I encountered was debugging the speech board which was wired-wrapped and also soldered. It took bout six weeks to complete the hardware and software. I am still enhancing the software. Cost was about $300. You can see more at my webpage: http://home.san.rr.com/balderrama1/robot.htm Email: jimb@san.rr.com