Total Hour Meter: Helps you track the number of hours you put on your machine; the display shows the total running time of the machine and remains visible. TOT hours are not resettable; reads up to 999,999 hours; accurate to 0.1 hours. Works on both AC/DC powered devices: 6V 12V 24V 36V 48V 72V 110V 120V 230V. Wide Voltage Range: AC/DC 5-277V; compatible with AC/DC voltage. Data Storage & Installation: Automatic data storage when the external power is turned off; Built-in CR2050 battery keeps the recorded data constantly; Easy to install; Snap-in design and fits standard panel cutout; Replacement part. Compatible with Zero Turn Lawn Mowers of various brands: Husqvarna Briggs & Stratton Toro Craftsman MTD Snapper Murray Ferris BillyGoat Yazoo CubCadet Troybilt; also compatible with other AC/DC powered devices: compressor, tractor, excavator, generator Quantity: 1 piece Color: Black Display window size (visible): 24.5 mm * 12.5 mm Product size: 58.4 mm * 58.4 mm * 37 mmladace