Brushbots are based on the Bristlebot by Evil Mad Scientist Labs. The latest version of Brushbots use two toothbrush heads for increased stability, rechargable lithium-ion 2450 coin cell batteries, waterproofed pager motors, and laser cut frames. By positioning the brush heads slightly off center, it is possible to get each Bot to behave in a unique fashion. Bristle hardness (soft, medium, or hard) also affects each Bots behavior.