Feature 1. Real-time display of battery health, temperature, charging and voltage values 2. Battery starting and monitoring system charging system 3. Data abnormality alarm to remind you of the battery status in time 4. Powered by solar panels, with Type-C charging interface, very low power consumption, one charge can be used for a week 5. 433MHz accurate transmission, status monitoring battery in real-time 6. Intelligent vibration induction, intelligent screen off and bright screen, automatic switch on and off, consumption low power 7. Patented algorithm, the longer the time, the more accurate. 8. Applicable to all 12V starter batteries, multi-purpose, can be used in cars, trucks, yachts, motorcycles The main function Battery test; Crank test; Tension test; Charging Test; Diapaly Health; Cost View; Type-C Charging; solar charging; Wireless Transmission Wide Application Covers all 12V 100-2000CCA batteries including regular flooded, AGM flat plate, AGM spiral or gel batteries. Works on cars, trucks, motorcycles, RVs, SUVs, ATVs, boats, yachts, lawn mowers, and even golf carts. Installation steps: Step 1: Attach the Negative Connector (Black) Firmly To the Negative Battery Terminal. Step 2: Attach the Positive (Red) Connector Firmly To the Positive Battery Terminal. Step 3: Attach the Device To The Battery Surface With The Supplied Double-Sided Tape. Please Clean the Battery Surface Before Repairing. Step 4: No Installation Required, Just Place It In Front Of The Windshield Charging Mode: Charging Type-C Charging Solar Power Built-in Shock Sensor Automatic switch, no prior notification required Two Modes: Daylight Mode Mode Evening All Car Tester 12V Battery Test Test Crank Load Start Test Charging Test Battery Voltage Specifications: Display Built-in lithium battery capacity: 750mAh Charging input: solar panel, TypeC Display: Monochrome LCD display with light Background Protection: Fuse Default Operating temperature: -20°-70°C Storage temperature: -30°-80°C