Features:1real-time monitoring: the liquid crystal display screen at the same time display 4 of the tire pressure and temperature gives you real-time understanding of the tire condition. Two charging method: tire Pressure Monitoring System (TPMS) is a combined with solar panels, fast charging, USB charging (average resolution time not including a USB cable). Intelligent alarm: once the occurrence of an abnormal state occurs leakage alarm, high temperature alarm, high pressure alarm, low pressure alarm alarm. LCD digital screen: clear reading of bright reserve list; Pressure units for BAR/PSI temperature unit is /, all auto tire real time data at a glance. Effective protection:The high sensitivity sensor has a waterproof, anti-corrosion, anti-theft features, even on a rainy day you don't have to worry about your driving safety.Notice:Actual color may be slightly different from the image due to different display and light effect.Please allow 1-3cm deviation due to manual measurement.Description monitoring: LCD color display operating temperature:-20 to 80 working voltage: 3.5-4.2v the day the operating current/night operating current/standby current:< 20 ma / < 4 ma / < 50 ua transmitting frequency: 433.92 mhz + / -20 kHz transmission mode: frequency shift keying pressure Transmitter bar/PSI charging Method: Solar/USB (average resolution time not including the USB cable) battery: 1*402040 3.7V 300mAh display size: about .9.5 * 3*1.5cm display the weight (with solar panel): about 71g sensor: operating temperature:- 40 ~ 125 working voltage: 2-3.6v standby current:< 1 ua transmitting frequency: 433.92 mhz + / -20 kHz transmit power:> 8 dbmOpen and Distance:> 30 m battery (each sensor):1 * CR2050 3V 330mAh sensor size (each): about 6.5mm * 3.6mm * 1.5cm sensor of the weight (each):Approx.30g packing size: 21*15*6cm / 8.27*5.91*2.36 package Weight: 370g/13.05ozPacking list:1 * Display4 * internal sensor4 * circulation valve1 * mat1 * a bag of screw1 * User Manual (English)