VSTM Smart Car TPMS Tyre Preure Monitoring System Solar Power Digital LCD Display Auto Security Alarm Systems Tyre Preure Features: Real time Monitor tire preure can improve fuel efficiency, prolong tire life, increase traffic safety and monitor temperature. LCD displays tire preure andtemperature Visual and sound warning Air leakage warning, low preure warning, high preure warning High temperature warning, low power warning and no signal warning Solar power for normal use. Available USB charge for sunle day Monitor x1 Solar Power Charging : up to 15% conversion efficiency Solar Panel : Poly crystalline silicon material Wirele Frequency : 433.92MHz Built-in Battery : 400 mAh / 3.7V LED Display : 2.7 inch Material : ABS + PC Working Temperature : - 20 ~ +80 Charging Socket : Micro USB / DC 5V Weight : 71g External Sensors x4 ( Optional ) Battery ModelCR1632 Working Temperature : - 40 ~ + 120 Working Preure Range : 0 ~ 4.1 bar / 0 ~ 60 psi Preure Accuracy : 1.5 psi / 0.1 bar Temperature Accuracy : 3 Wirele F requency : 433.92MHz With Anti-theft Design Material : Nylon Gla Fiber (PA66+30%GF) Engineering Plastic Weight : 11g Size : 23() *18 (H) mm Battery Life : 2 years Internal Sensors x4 ( Optional ) Battery ModelCR2032 Working Temperature : - 40 ~ + 120 Working Preure Range : 0 ~ 4.1 bar / 0 ~ 60 psi Preure Accuracy : 1.5 psi / 0.1 bar Temperature Accuracy : 3 Wirele Frequency : 433.92MHz With Anti-theft Design Material : Nylon Gla Fiber (PA66+30%GF) Engineering Plastic Weight : 39g Battery Life : 5 years