Module nature: It has real MPPT solar maximum power point tracking function, full-automatic intelligent charging management and low power consumption. Input voltage: DC 8-28V input DC voltage. (AC input is prohibited) Charging indicator: Yes. The fast charging red light is long, and the fully red and blue light flashes alternately. Full stop automatically. MPPT function: Yes. MPPT's automatic tracking function of maximum power point can make full use of solar energy to charge. Minimum voltage difference: 1V (because it is a step-down and voltage-stabilizing module, the input voltage should be at least 1V higher than the output). Ultra-low power consumption: Yes! Adopt ultra-low dropout design to achieve low power consumption and higher conversion efficiency, and professionally adapt to solar panels. Working temperature: industrial grade (-40℃ to +85℃) Load adjustment rate: 1% Voltage regulation rate: 0.5% Conversion efficiency: Max:93% :95% Different lighting conditions are different. Charging mode: fully automatic and intelligent three-stage charging mode. Self-tracking solar power and automatically adjusting charging current. No-load current: 3MA even weak sunlight in the morning can be easily started automatically, eliminating manual switch. Input reverse protection: Yes. Exclusive design of MOS tube ultra-low dropout anti-reverse connection protection, input reverse connection does not work. Output reflux protection: Yes. Effectively prevent the electric backflow of the battery at night! Connection mode: with connection terminals. (Due to different printing batches, if there are slight differences in the actual words, it not affect the use) Color: Yellow Material: PCB Package Contents: 1 * Solar Charging Panel Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.