Keep Unwanted Visitors Away With a Motion Activated Sprinkler : 9 Steps (with Pictures) - Instructables
Amazon.com : Orbit 62100 Yard Enforcer Motion-Activated Sprinkler with Day & Night Detection Modes, Black : Lawn And Garden Sprinklers : Garden & Outdoor
Motion Activated Sprinkler – Cool DIY Tools
Motion Sensor Switch for Light , Alarm or Sprinkler