About Christmas Lights. Christmas lights are a must-have item for the holiday season. Indoor options for your tree, outdoor options for your home, and unique mini-lights for hanging around the house or decorating furniture are all ideal for adding holiday spirit to every space. The DEWALT 20-Volt Max Cordless Combo Kit (DCK420D2) is ideal for a variety of projects on the job site or at home. This versatile kit includes…