... material to choose 4, 18mmX65m 18650 Lithium iron phosphate battery :1, long lifespan2, enviromental friendly3, different material ... COMMUNICATION EQUIPMENT:communication base station, hand-held position meter, portable broadcasting station.2,MEDICAL EQUIPMENT:monitor, electorcadiograph ... light curing unit3,INDUSTRIAL EQUIPMENT:water quality testing meter, stone tester, laser indicator, car arrester, ...