4 USB, color display, ABS flame-retardant shell, intelligent circuit protection, stable output, conversion efficiency up to 97%, overload protection, short circuit protection, battery reverse connection protection, temperature protection, solar panel reverse connection protection, mostly used for RV solar panels In-vehicle power supply, large-scale solar panel power generation system, solar panel environmental protection street lights, power supply for yachts and ships. The aviation alloy heat dissipation backplane prevents the equipment from generating heat during long-term use, and effectively cools and protects the electrical appliances.