The AR110 board is equivalent to the Arj button refrigerator-freezer board and has the same function as the main board. This board can be changed and used in three modes: freezer (F), refrigerator (R) and refrigerator-freezer (F/R). This board has a switch to activate the optimal mode (Eco) and will lead to optimal use of the device. The sensor used for this board is 50K. This board has an 18-month warranty.