TireMinder Wireless Tire Pressure Monitoring System for Car Type: Cell Phone Holder Compatible Phone Manufacturer: MINDER RESEARCH INC Features: Real time PSI and temperature readings. Perfect for older vehicles that do not have TPMS,. Monitor all tires with aluminum, brass or stainless steel valve stems. Reads pressures up to 80 PSI plus tire temperature. Easy-to-read monitor updates information every four minutes.