Perfect 4-Quart Backpack Vacuum comes with a remote on/off switch that you can store in the backpack harness. Cord lock keeps the cord locked in place and plugged directly into the unit. Airflow indicator blinks if the bag is full or the machine is clogged, protecting the motor from overheating. CRI-certified vacuum shutoffs in 15 seconds if airflow is impeded. Built-in heat sensor shuts motor off to prevent overheating. True backpacking harness features extra-cushioned, adjustable shoulder straps and a waist belt with built-in tool holders. Multiple filters include H-10 HEPA inner paper bag, SMS cloth bag and large HEPA exhaust filter for true clean air filtration. Static lift has a suction power of 120" or more suction power. Specially engineered design directs exhaust away from your body. 90-degree elbow cuff rotates 360 degrees for easy use and swivels on both ends. 16/3 extension cord is 50' long to vacuum larger areas. Hose stretches from 4' to 7'.