The benefit of the Wally system is its price and dead-simple setup. Some models like the WaterCop cost up to $400, while the Vivint flood sensor requires a $50 monthly service fee. At $300 for a hub and six sensors, the Wally is comparatively cheap. Photo 4 of 5 in Smart Detection System Prevents Home Water Damage by Alexander George

Smart Detection System Prevents Home Water Damage

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The benefit of the Wally system is its price and dead-simple setup. Some models like the WaterCop cost up to $400, while the Vivint flood sensor requires a $50 monthly service fee. At $300 for a hub and six sensors, the Wally is comparatively cheap.