E21 â??Backgauge and block control. â??Control AC motor or inverter. â??Intelligent and unilateral positioning. â??Work-piece counting function. â??Holding/decompression time setting. â??40 programs stored, 25 steps per program. â??One key back-up/restore of parameters. â??Unit for mm/inch. â?? Language for Chinese / English. If you are interested in this machine, please contact me.