This product is a maximum power MPPT boost charger with a maximum MPPT tracking efficiency of 98%. Applicable Batteries: 48V lead-acid or lithium iron phosphate batteries; 60V lead-acid or lithium iron phosphate batteries. Set the battery voltage before first use. The controller has a memory function and will maintain the set voltage until changed. Applicable Solar Panels: This controller is suitable for solar panels with an open-circuit voltage of 15-30V. Features overcharge, overcurrent, reverse solar charging, reverse battery polarity protection, over-temperature protection, and output short-circuit protection. Automatically turns off the display at night to enter standby mode to reduce power consumption. USB and Type-C can be powered by solar energy or batteries. Color: As Shown Material: plastic Package Contents: 1*Controller 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.