Wireless USB TPMS LCD Car Tire Pressure Monitoring System W/4 External Sensors Features: Adjustable view angle and screen brightness Real time monitor the pressure and temperature of the tires. Intelligent sleeping mode for power saving. Visual and sound warning Air leakage warning, low pressure warning, high pressure warning High temperature warning, low power warning and no signal warning Can be installed on windshield glass or dashboard. Visual and audible warning for abnormal tire pressure and temperature. 4tires pressure and temperature data at a glance. Fixed Bar or Psi pressure unit for selection . Fixed temperature unit for selection. Specifications: Material: ABS+PC Color: Black Type: External Working Frequency: 433.9200MHz±0.1MHz Working Voltage: sensor: 2.0-3.6V; display: 5V Working Current: sensor ≤1uA; display ≤0uA Note:This tpms requires USB charging to use,not the solar battery type with power storage function,please know this before you buy it. Package Included: 1 x  Monitor 1 x USB Cable 1 x Installation tool 4 x Lock Nut 4 x External sensor