Poolguard PGRM-2 In-Ground Pool Alarm NSF Certified to ASTM Standard F2208 Made in the USA In House Remote Receiver. Horns are 85 decibel at 10 feet Battery Powered,Poolguard PGRM-2 is designed to detect intrusions similar to a one year old child Can be used in pools up to 20 x 40 or 800 square feet 3 year warranty