With this product, it will accurately show your tires situation depending on the data reading on the display. In this way, you can know the tire condition and keep your travel safe.   Features: Applicable to all types of vehicles, not only SUV, ORV, minibus but also wagon.  Two ways of charging for your TPMS, USB charge and powered by solar energy, no need to worry about electricity anymore.  Real-monitoring in time of pressure & temperature of 4 tires.  Built-in sensors and external sensor options, meets all your needs.  Color Digital LCD display, clear to show tire information.  IP67 waterproof grade, shock and fall proof, safety protection, wear resistance.   Specifications: Material: ABS;   TPMS Receiver:  Operating Voltage: DC 5V;  Receiving Frequency: 433.92MHz;  Powered by: 1 * built-in 403040 3.7V 400mAh;   Internal Sensor: Working pressure: 0 - 51 psi / 0 - 3.5 bar;  Transmission frequency: 433.92MHz;  Pressure accuracy: ± 1.5 psi;  Pressure unit: psi/bar;  Temperature unit: Deg.C / Deg.F;  Operating voltage: DC 5V;  Waterproof grade: IP67;  Powered by: built-in CR2050 button cell (Included, Already place in each sensor);  Lifespan: 2 - 5 years;  Charging: USB / Solar;   External Sensor: Working pressure: 0 - 51 psi / 0 - 3.5 bar;  Transmission frequency: 433.92MHz;  Pressure accuracy: ± 1.5 psi;  Pressure unit: psi/bar;  Temperature unit: Deg.C / Deg.F;  Operating voltage: DC 5V;  Waterproof grade: IP67;  Powered by: built-in CR1632 button cell (Included, Already place in each sensor);  Lifespan: 1-2 years;  Charging: USB / Solar;   Package Size: 155 * 135 * 60mm / 6.10 * 5.31 * 2.36 in;  Package Weight: 316g / 11.15 ounce;   Package List:  1 * Tire Pressure Monitor;  4 * Sensors;  1 * USB Cable;  1 * Wrench;  1 * User Manual