This air sled appliance dolly will lift up to 400 pounds with a force of just 1% of the load weight (i.e. a 400 pound piece takes only four pounds of force to move!). Glide right into tight spaces with literally just your fingertips without any damage to your flooring. Cannot go up or down stairs, for horizontal moves only. This air sled comes with two 9″ x 36″ air beams, blower, hoses, carpet adapters, and a carrying bag. This item requires a standard 110v power supply.