Multiple Charging MethodsSTEELMATE tire pressure monitoring system TP-S11 is Solar charged automatically, and it also can be charged by the USB for auxiliary charging when it is not sunny. No worries about powering off and help you be more focused on driving. Six Types Of Alarms And User-set Alarm ValuesSTEELMATE tpms tire pressure monitor system TP-S11 comes with six alarm modes, including fast/low leak alarm, high-pressure alarm, high-temperature alarm, sensor low voltage alarm, and sensor fault alarm. You can set the pressure and temperature alarm values in your free. Auto Backlight & Sleep & Awake ModeThe auto-adjustable backlight of STEELMATE tire pressure sensor TP-S11 can clearly display data in low light or strong light. Real-time monitoring and real-time display of data is the best helper for safe driving. It will switch to sleep energy-saving mode after the vehicle stops running for 10 minutes, and will automatically wake up when the car is turned on