1. Certified to ASTM F2008 for pool alarms 2. Comes with remote receiver which sounds alarm inside home when unit detects entry into pool by children, pets or intruders. 3. Electronic sensor detects objects weighing 18 pounds or more. 4. Pool Alarm (unit) is battery operated - 6 "D" cells. 5. Tested against the toughest standards all over the world.