Support MPPT (Maximum Power Point Tracking) function to maximize the efficiency of solar panels. Support solar panel/USB connection battery charging Suitable for 6V~24V solar panels, DC-002 jack input or screw terminal input. Onboard MPPT SET switch, select the level close to the input level, improve the charging efficiency Two 5V output interfaces: pin header and USB interface. On-board large-capacity aluminum electrolytic capacitors and chip ceramic capacitors, reducing ripple and stable performance 14500 battery holder and PH2.0 battery connector, used to connect a of 3.7V lithium batteries Multiple LED indicators to monitor the status of solar panels and batteries. Multiple protection circuits: overcharge/overdischarge/reverse connection protection/overheat/overcurrent, stable and safe use Note: the 14500 battery is NOT included. Specification Solar panel input voltage (SOLAR IN): 6V~24V size: 65.2x56.2x22.9mm Material:PCB colour:As shown Package Contents: 1 x Solar Power Management Module Only the above package content, other products are not included. Note: Light 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.