【INTELLIGENT LCD SCREEN DISPLAY】- In the normal working state, the LCD screen will display the input/output voltage and battery capacity. When the inverter is in an abnormal state, the LCD screen will show the corresponding trouble code. For example, OL indicates overload or short circuit shutdown, HI denotes high voltage shutdown, LO signifies low voltage shutdown, and OH represents overheat shutdown. You can troubleshoot the inverter based on these trouble codes.【18W USB OUTPUT, 36W USB-C PORT &2 AC OUTLETS】- With professional and advanced technology 4000W heavy duty for case of emergencies like hurricane, storm, power outage. 2 AC outlets for multi-purpose emergency use on vacations, business trips, and camping. 2 different fast charging usb ports can power your 汽车用品 quickly.【TRAVEL AND EMERGENCY EQUIPMENT ESSENTIALS】- This converter is suitable for car vehicle, truck, rv, boat, road trips, camping, outdoor work. It can also power lights, routers, fans by connecting a deep-cycle battery during power outage.【6 COMPREHENSIVE SAFETY PROTECTIONS 】- The OLTEANP car inverter includes undervoltage protection, overvoltage protection, overload protection, over-temperature protection, short-circuit protection, and reverse connection protection. With these safeguards in place, you can have confidence that your inverter and connected devices will operate safely and reliably.【UPGRADE SILENT FANS SMART TEMPERATURE CONTROLLED】- When the inverter's internal temperature exceeds 42℃ or the machine's power efficiency surpasses 40%, the fan will initiate operation. Conversely, when the inverter's internal temperature drops below 38℃ or the machine's power efficiency falls below 30%, the fan will cease operation. The low-interference technology ensures that the fan operates quietly.