Huicocy Rechargable Solar energy usb cigarette light charger TPMS Tire Pressure Monitoring Intelligent System with LED Display 4 Sensors DIY Tire Gauge Vehicles Car high quality. The tpms is a wireless RF sensing device designed to measure and display the tire pressure and temperature. the tpms funcation can help you to avoid tire accidents due to tire fairlure, to reduce fuel consumption and to extend the tire life. Once installed in your vehicle,the tpms will warn you of an abnomal tire situation immediately with an audible and visual alert. Display with solar energy power supply. it is also with rechargable battery and usb cigarette lighter charger which make sure normal use in cloudly or raiiny days. External valve-cap sensor for DIY installation.