Designed to warn users in case of electricity in pool water, the Shock Alert is a volt detector and alarm system. It can be used in swimming pools, hot tubs and docks. The system monitors the water 24/7 and an alarm sounds when 5 or more volts of electricity is detected. It’s designed to prevent electrocution from shorts in underwater lights and other electrical equipment. The product is powered by a 9-volt battery. Contact: Safewater Systems Inc, (941) 916-7120: