Blue Wave NA4212 Poolwatch Pool Alarm System NSF Certified to ASTM F2208 requirements for pool alarms Electronic sensor detects entry into pool by children, pets, or intruders Remote receiver sounds when the pool alarm is activated100 ft wireless range Alarm is designed to detect objects weighing 18 pounds or more 110V A/C or 9 volt battery powered receiver Kindly refer the User Manual in the Technical Specification section for specifics on operating and installing this alarm. These setup and care instructions are crucial to the alarms proper operation.