Dual units adjustable tire pressure monitor system displays real-time pressure and it have alarm when tire problem occurs.   Features: LCD display, powered by cigarette lighter plug.  Real time monitoring, individual tire data showed.  Wireless transmission, no wires connection is needed.  Visual and audible alarm.  Tire leakage, high/low pressure and high temperature alarm.   General: Pressure unit: Bar / PSI (optional);  Package size: 15 * 12 * 6cm / 6 * 4.7 * 2.4in;  Package weight: 240g / 8.5oz;   Specifications: Sensor: Operating frequency: 433.92MHz ± 0.05MHz;  Operating voltage: 2.1-3.3V;  Operating temp.: -20 - +60℃;  Pressure range: 0-5.2Bar / 0-75PSI;  Display: Operating frequency: 433.92±0.015MHz;  Operating voltage: 12V±3V;  Operating temperature: -20-70℃;  Default warning value;  High pressure value: 2.9Bar / 41PSI (unit is optional);  Low pressure value: 1.7Bar / 25PSI (unit is optional);  High temperature value: 80℃ / 176℉;   Package List: 1 * Display;  4 * Sensors;  1 * Set of Accessores;  1 * Spanner;  1 * Manual