Optional remote add-on gives you the ability to control temperature settings wirelessly. Simply pair the remote with a Dual Digital Controller (sold separately). Water-resistant and operates using a CR2032 lithium battery that can easily be replaced if needed The wireless unit can be placed or attached anywhere to make temperature control safe and convenient Remote Dimensions: 2" x 2" x 0.6" To Pair the Remote: Push both buttons on the Dual Digital Control for about 5 seconds until it begins to blink Once it begins blinking, turn on both dials of the wireless remote Within a few seconds the Digital Controller will stop blinking, indicating the remote has connected