PoolGuard PGRM-AG - AboveGround Pool Alarm Detects Intruders Snaps On Top Rail The Poolguard Pool Alarm comes with an in-house remote receiver that has a range up to 200 ft., and comes with a 12 volt power supply Works with pools 30' in diameter and oval pools up to 20' x 40' (800 sq. ft.). Designed specifically for use in above-ground pools.