Wide Voltage Power Supply: The default voltage supply are compatible to most daily use: AC/DC 60V,72V,90V,120V,AC 230V,240V etc. Maintenance Hours Accumulate: It keep track of run time to schedule the machine regular maintenance,such as oil/air filter change; hours can be reset to 0 and read up to 999,999 hours. Water & Shock Resistance: Assemble PC transparent sheet to keep the display window away from damage, built-in 100% epoxy resin craft for strong water and shock resisitance. How to use it: It only requires drilling a mounting hole and simple hooking up for easy snap-in mouting;Mounting hole size:approx 45.5X22.5mm(1.79×0.88 inches);Hours will start to accumulate once you connect "postive" and "negative" with power equipment,trigger the timing by "EN" connection, the hours can be reset once you connect "positive" and "R". Others: Excellent water resistence(IP67); COMS EEPROM for data retain about 25+ years;Low power consumption;Key or manual switch are all compatible;Reliable after-sales service and excellent technical support.Manufacturer: Ningbo ao er mi te Electronics Co.,Ltd Size: With Fixed SupportHonorMeet AL-HM037B Digital Running Hours Meter, Works on AC 85V to 250V,DC 60V to 150V, Easy to install, Waterproof by 100% epoxy resin sealing.Product Features:▪Display total running hours always-on with hourglass indicator state beginning,value reset by manual.▪TOT hours range: 0-999,999 hours with 0.1/1 hours accuracy.Specifications:▪ Product dimension: 48X23X34mm(1.88x0.94X1.33inches)▪ Display window size: 25X7.6mm(0.98x0.29 inches)▪ Housing material: ABS▪ Accessories: 4.8mm insert spring*4, 4.8mm spring sheath*4,User manual,mounting support,screws. Waterproof rate: IP67.