If you have already own or plan to purchase the EnviroAlert Wireless Environmental Monitor and Alert System Base Unit you can use this Wireless Humidity Sensor to monitor the ambient room humidity. Using wireless transmissions you can eliminate the need for long wire runs from a hardwired sensors all the way back to your base unit. This reduces costly and difficult installations. With an adjustable antenna for optimal signal acquisition, wireless transmission can go up to 1000 feet. The sensor also has a surface mount design for a clean looking installation.