Never look at stairs the same way again. The LiftKar Heavy Duty Stair Climbing Hand Truck is equipped to conquer any flight with minimal effort from the operator. With its dual-function automatic climbing system you can use extra care and climb one s tep at a time or select continuous climb for more manageable loads. An automatic braking system kicks in at the edge of each step to keep you in control. You can disable this function when operating on level or uneven surfaces. Key Features Automatic ally applies brake when wheels are at edge of step to help prevent load lossBrake can be disabled for use on level groundIncludes cargo strap to secure loads2 operating modes: Single Step (ascend or descend button must be pressed after each step for maximum control) and Continuous Climb Up/Down controls on each side to accommodate left and right hand usersErgonomically designed handles with non-slip rubber gripsPuncture-free solid rubber tires- suitable for use on smooth and rough surfaces such as rock drives or cobblestonesPerformance Data2 climbing speeds: 6 steps/minute and 10 steps/minuteAverage number of steps with fully charged battery:440-lb load - 220 steps550-lb load -190 steps 725-lb load -120 step