The PE953 is intended to be a low cost Pool and Spa controller, used to monitor water temperature, cleaning, and chemical circulation for consumer level pools and spas. This device will control the new PE643 Zwave compliant receiver.Fully submersible and shock resistant Z-Wave certified - use with any Z-Wave devices, even those from another manufacturer Backlit LCD display makes for easier programming, day or night Includes 3 AA batteries and self-stick labels for naming the function buttons