The Die Free Co Grip Plug accepts two CR123, AA, or AAA batteries. It also has a slot for a single CR2032 battery, a pocket for a small Allen or Torx wrench, and a slot for a MultiTasker NANO Tool. In addition to the storage, the PLUG also extends the length of the grip .25" and squares off the back of the grip to fill your palm. FeaturesCompatibility: Kung Fu GripHeight: 1.5"Retention: FrictionMaterial: Durable RubberWater Drainage Holes on the Bottom