Our line of Professional 900 MHz wireless sensors are available in various configurations. They are compact and durable and are ideal for a wide variety of applications. User customization allows you to set the frequency of readings and gives you the ability to set thresholds for notifications from the system. The Professional line of 900MHz sensors has a transmission range of 250-300 feet. The sensors are powered by 2 AA batteries for extra long life (up to 4 years) and the new flanged housing allows for easy mounting to various surfaces.