This tire pressure monitor can display four tire pressures in real time, help users monitor the condition of tires in time, increase driving safety, and has a clock function that is suitable for different models. Characteristics: Intelligent accuracy: real-time monitoring of four tire pressures, tire temperature, precision and performance, can capture the tire situation in a timely manner, reduce the frequency of accidents and increase driving safety. There are two types of sensors available: the user can choose a set of embedded sensors or a set of external sensors according to their needs. Clock and power display: with the clock display, it can display time, power and other information simultaneously to remind users to charge on time. Wireless transmission: wireless data transmission, intelligent and efficient real-time update. Solar energy: thanks to solar energy, energy-saving and efficient, you can also charge while driving, with a long service life, but you can also use a USB charging cable. 360 Rotating: tire pressure monitor can rotate 360 and adjust 45 up and down, set at the right angle and field of view. Technical data: Material: aluminum alloy copper plastics Type: set of internal sensors TPMS Receiver: Battery: built-in 3,7V, 400mAh lithium battery; Operating voltage: direct current 5 V RF transmission frequency: 433,92 MHz Pressure Unit: psi/bar Temperature Unit: Deg.C / Deg.F. Operating temperature: -20 85 Storage temperature: -40 125 Internal sensors: Operating pressure: 0 51 psi / 0 3,5 bar Pressure accuracy: 0,1 bar Transmission frequency: 433,92 MHz Operating temperature: -20 85 Storage temperature: -40 125 Operating Voltage: 2,03,6V Waterproof Class: IP67 Battery: built-in CR24500 battery Battery life: about 25 years (non-replaceable, sensors should be replaced when the battery runs out) Item Weight: Internal Sensor Kit: 270g / 9,5oz Package Weight: Internal Sensor Kit: 320g/11,3oz List of things to pack: 1 * Receiver 4 * internal sensors 1*USB cable 1 * User Manual