Feature:Low air preure/high temperature alarmHigh Temperature / Leakage / Low Battery AlarmWirele connect by sensors, easy installSolar power charging;LCD display screen, Simple user interface;Smart start: parking automatically sleep, the car starts automatically wake up.Specifications:Build-in Sensor ( Option 1)- Please install in by Profeional car center-More stable and accurate-Anti High Temperate and Cold-IP67 Protection / Waterproof-Working Temperature: -40-125Working voltage2.1V-3.5VTransmiion frequency:433.92MHZ-Battery Life: 5 Years, replaceableSize: 22cm*20cm*3.6cmPackage weight:301gExternal Sensor ( Option 2)- Easy to install, convenient to replace-Dust-Proof / Water-Proof / Anti-theft-Anti High Temperate and Cold-IP67 Protection / Waterproof-Working Temperature: -30-80Working voltage2.1V-3.6VTransmiion power