Supports MPPT (Maximum Power Point Tracking) function, maximizing the efficiency of the solar panel,Multi protection circuits: over charge / over discharge / reverse protection / over heat / over current, stable and safe to use Supports solar panel / USB connection battery charging For 6V~24V solar panel, DC-002 jack input or screw terminal input,Onboard MPPT SET switch, select the level closed to input level to improve charging efficiency Two 5V output interfaces: pinheaders and USB port,Onboard high capacity aluminum electrolytic capacitor and SMD ceramic capacitor, reducing the ripple, stable performance 14500 battery holder and PH2.0 battery connector, for connecting multi kinds of 3.7V Li battery,Several LED indicators, for monitoring the status of solar panel and battery Overview This solar power management module is designed for 6V~24V solar panel. It can charge the 3.7V Li battery through solar panel or USB connection, and provides 5V/1A regulated output. The module features MPPT (Maximum Power Point Tracking) function and multi protection circuits, therefore, it is to keep working with high-efficiency, stability, and safety. It is suited for solar powered, low-power IoT, and other environmental protection projects. Solar panel input voltage (SOLAR IN): 6V~24V Micro-USB input voltage (USB IN): 5V Pinheader / USB output (USB OUT): 5V 1A Charging cutoff voltage: 4.2V1% Over discharging protection voltage: 2.9V1% Solar panel charge efficiency:: ~78% USB charge efficiency:: ~82% 3.7V battery boost output efficiency: ~86% Max quiescent current: less than 2mA Operating temperature: -40~85 Dimension: 65.2mm x 56.2mm x 22.9mm Note: the 14500 battery is NOT included. color:Blue Material:PCB Package Contents: 5 x Solar Power Manager 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.