It must be removed before you power on the machine!! Usage: Caution Use a screwdriver counterclockwise to remove the RED FIXED screws under the device.(As shown in figure) Product name : HL-AH G6 Amalgamator Brand : Zoneray1. Time setting with memory function. Security Guard design, motor will stop when the mask is open. Noiseless, Stable operation, Electrical safety standard met. Automatic alarm to remind, Easy maintenance.