Charging time: 3 hours. Working time: 7 hours. Air supply flow rate. First gear: 62 L/min. Second gear: 74 L/min. Notice: Not included filter box. 100% brand new and high quality. This Powered Supplied BREATHING systems is a positive pressure safety device to make sure no air borne contaminants can enter the air breathing space. This system is for workers who are working in a thin air environment or toxic environment. Place the long air pipe and filter in a clean air area, and the Turbo air pump it will provide a continuous flow of cool clean air to the headpiece or facepiece. Please understand because of the light irradiation or computer display difference, so I can’t guarantee photos and real color is 100% Package Included 1 set of Full Face Gas Mask – Not included filter box. Please repack the item carefully. We will reply you with 24-48 hous. (except weekend and public holiday) We believe the good communication will resolve everything.