"Activated by IR energy, this kit remains motionless until it detects IR energy. It will come to life when you press random buttons on any TV/VCR remote or by our IR Activator Robot Kit (to the right). When activated, it vibrates/scoots on any smooth surface and also flashes 7 bright LEDs. Movement stops as soon as the source of IR energy stops. Operates from one 9V battery (not included) and has a special vibrating motor disk and sensitivity control. Round PC board is 2 3/4"" in Dia. and can be customized by painting it with your paint before you solder it (if desired). Complete with all parts, PC board and instructions. Skill Level 2."