Product InformationSolar Powered Charging and USB Powered.The tire preure monitoring system is solar-powered, but this TPMS can also be charged through USB when the sun isn't shining.Alarm Types and User-Defined Values - The TPMS tire preure monitoring system preure and temperature alarm values can be set by the user themselves.The TPMS Sensor is tiny in size, light in weight, has high tire preure detecting accuracy (error range of no more than 3 psi). The TPMS sensor is simple to install and survive hard situations.Switch Button And Power-Saving Mode - Tire Preure Monitoring System has a power-saving mode and a switch button, which use le power and last longer.The Tire Preure Monitoring System will go into sleep mode if it has been in a static state for more than 10 minutes.External Sensor (4 PCS)Easy to install(Installation without profeional personnel)Stable & Accurate (Accurate data makes sense)IP67 Protection / Waterproof (Respond to various environments)Anti High Temperate and Cold(-40-125)Battery: replaceable (2 YearsLife)The battery can be replacedInternal Sensor(4 PCS) (Only Style-C)Profeional personnel are required for installation (special tools must be used).Stable & Accurate (Accurate data makes sense)IP67 Protection / Waterproof (Respond to various environments)Anti High Temperate and Cold(-40-125)Battery: replaceable (2 YearsLife)The battery is not replaceable