* Vacuum blower is made of flame-retardant plastics engineering material with high heat resistance. * Class N200°C top-grade treated copper wire. * 2-layer insulation tested voltage at 4000V. * Antistatic system To prevent electric shock to the user while in use. Blower vacuum cleaner * Auto Cut carbon brush is convenient to replace the carbon brush, if the carbon brush is almost exhausted, it will stop working automatically.