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We are offering tire pressure monitoring system - tpms external tpms for car description specification for car tpms storage temperature -40~125°c operating temperature -40~125°c operating humidity 100% working frequency 429.925mhz pressure monitoring range 0-900kpa pressure reading accuracy ± 1 psi temperature reading accuracy ± 1°c launcher power >-16dbm battery voltage dc 3v sensor weight 8.8g sensor dimension 19mm x 20.2mm monitoring lcd display with 7 colors backlight operating voltage dc 5v operating humidity 100% storage temperature - 25~ 80°c operating temperature - 40~ 90°c.