USER BENEFITS: Enhanced dust and drip-proof performance for use in outdoor applications or harsh environments. Single sleeve keyless chuck allows for easy bit installation/removal by one hand. Twin LED Job light with pre-glow and afterglow functions Battery fuel gauge The power remaining in the battery can be indicated in 3 stages simply by pushing a button; 3 lights on: more than 50% of full battery capacity. 2 lights on: 20% to 50% of full battery capacity. 1 light on: less than 20% of full battery capacity”