With a 28" sweeping path, the Terra 28 cleans up to 31,200 sq. ft./hr of unobstructed area. It features a 19.7" main broom and a 12.4" side broom. The Advance Terra 28 is powered by one 12V, 100-AH maintenance free gel battery. Sound level is 59dB for quiet operation. Onboard charger is standard for charging on the go.