The iEOG of each Biolux machine is sensitive but strong at heart.  Over the 20 years' investigation, we have clearly understood the characteristics of every iEOG including the work situation and lifespan.  Biolux has built-in system to clearly inform user/s its operation situation.  Any malfunction of the iEOG will be displayed to assist user/s to contact our global agents on time.  Only honest companies can provide real assurance like this.