All PoolEye Swimming Pool Alarm Systems Feature the Most Reliable Technology Available: Subsurface Wave Detection Available for Aboveground Pools: PE-12 PE-13 with In-Home Remote Available for Inground Pools: PE-20 PE-21 with In-Home Remote and Pool Water/Air Temperature Monitor PE-22 with In-Home Remote and 2nd Level of Protection - Infared Perimeter Detection All YardGard Gate Alarm Systems are ETL - Listed to UL Standard 2017. 2 Battery Powered Models and 1 Hardwired Model to Choose From. YardGard Gate Alarm Systems Meet or Exceed U.S. Barrier Codes.