The Dometic E  E 21332251  Multi Zone Power Board Module designed for control of heating, cooling, and air systems in RV's. Part No 3312226.000, SA 154624, Etratech 54-070781-E. See label for list of air conditioners that it is used for. This module allows for customized power distribution to different zones, providing enhanced control over the temperature in various areas of the living space. This is a used module from a Tradewinds RV and in working condition and used to control the rear air conditioner and heater. Operates on 12VDC, Dometic brand, reliable performance and efficient operation.