WORKING VOLTAGE — Wide operating voltage range: AC85-250V, DC60-150V, applicable to most AC/DC powered device with common voltage: 72V,110V,120V,220V,230V etc. HOURS — Keep track the hours of useage when power is on, hours reset for tracking anew;hours range: 0 to 999,999 hours. INSTALLATION — Easy to mount by panel cut-out size 1.79X0.88 inches, snap-in design and suppot kit keep the mounting more stable. WATER/SHOCK RESIST — Display with PC transparent board and 100% epoxy resin sealing craft can keep it away from the damp or moist, which also prevent the strong shock between transport or cleaning. OTHER FEATURES— Reliable aftersales guarantee(2 years) and professional technical support.