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The Sensaphone WSG30 is a flexible wireless monitoring solution. It's useful for applications where it's not viable or cost-effective to hard-wire the sensors, such as medical freezers/refrigerators, data centers and manufacturing plants. The system’s base unit can communicate with as many as 30 wireless sensors. And the sensors can be placed up to 300 feet away from the base unit. However, a successful installation requires some planning to make sure everything works smoothly.