The FDL-2X is the second major upgrade to the FDL-2. It replaces the knobs on the side of the blaster with a click wheel and OLED screen on the back. Gain access to settings and fine tune the operation of your FDL like you've never done before. Even save your settings to presets and recall them later. The FDL-2X also includes a built in speaker to warn you when your battery is getting low. It's all about control.