About This PACKAGE CONTENTS ---- 2 pieces hour meters, 1 large box containing 2 individually packaged hour meters, solving the need for maintenance of more than one engine.HM011F contains functions of tachometer, timer, service timer. HOUR METER----when the engine is off, the display shows the total running time of the engine and remains visible. Total hours can be reset; 0.1 hour precision. MAINTENANCE REMINDER----Programmable maintenance interval service timer (SVC), countdown to track service reminder time; when maintenance time is up, the service warning icon flashes to remind. TACHOMETER----Accurately records the speed of the engine when it is running, helps to adjust the engine idle speed; can be programmed for different engine ignition modes. OTHERS----Easy to install; Contains detailed instructions for use; Internal replaceable CR2450 battery, data retention after battery replacement; operation button can be turned off, data retention after shutdown;2-year warranty. Overview Brand : Runleader Material : Polycarbonate (PC) Item dimensions L x W x H : 0.01 inches Item Weight : 174 Grams Manufacturer : Ningbo Jiangbei Run Leader Electronics Co., Ltd