cordless mini grinder , with variable speed With CE,GS,UL,EMC,ROHS ,FFU, PAH'S certificate Cordless Mini Grinder LY707-4 -Voltage: 7.2,10 ... .8V (LI-ION) -No-load speed: 5000-25000RPM;-With 1/8"(3 ... .2mm) collect size; -Variable speed switch with reverse action for easier control -Charging time: 1 hour/ 3- ...