PoolGuard PGRM-2 In-Ground Pool Alarm The battery-powered PoolGuard PGRM-2 In-Ground Pool Alarm ($185, originally $280) is NSF Certified to ASTM Standard F2208, designed to detect intrusions similar to a 1-year-old child, can be used in pools up to 800-square feet, and has an in-house remote receiver. PoolGuard PGRM-2 In-Ground Pool Alarm $185 from amazon.com Buy Now