Usage Tips:LED Flash for low charge & high charge warning Specifically designed to monitor the power level of battery while charging or discharging. Memory option to recall last charge level. Display of 10 segment LED bar graph Wide operating voltage and temperature range. Hour Meter features a 6-digit, 7 segment LCD display. Operating and Storage Temperature: -40 Celsius~85 Celsius Operating current: 20 mA nominal Memory capacity: CMOS EEPROM Compatible Models: Golf Cart or other equipment powered 12V/24V/36V/48V/72V volt DC battery Product size: 5.8 * 5.1cm / 2.3 * 2.0in ( D * H ) Note: Before you connect the indicator to battery, please confirm the voltage of your battery first, and connect the positive electrode to the correct pin of the indicator on the back, wrong voltage connection maybe cause the battery indicator damage. Package List: 1 x Battery Indicator with Hour Meter 1 x Pack of Accessories 1 x User Manual ( English ) Note:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.