Blade Material: Stainless steel Working time: 240 Mins/180Mins/90Mins Warranty: 1 Year App-Controlled: NO Power Source: Electric After-sales Service Provided: Free spare parts Battery capacity: 3500mah/2000mah/600mah Material: ABS+Ceramic Blade Maximum Runtime: ＞180min Charging Time: 3 Hours Certification: CE ROHS FCC Power Supply: Electric Product name: Hair trimmer clipper set Model: RM-920 Private Mold: Yes Application: Outdoor,Hotel,Commercial,Household Washable: Yes