A telescoping wand enables you to keep your feet flat on the ground while allowing you to reach 1, 2, or even 3 stories high.
A high pressure hose is guided up the inside of the pole and connects at the tip. This lets you set the length from fully retracted to fully extended, and anywhere in between.
It's not all pie in the sky, however. It takes a fair amount of pressure to push water up in the air, so these wands connect to larger pressure washers with 3/8" hoses.