Features MPPT (Maximum Power Point) function to optimize solar panel efficiency. Includes multi-protection circuits covering overcharge, overdischarge, reverse polarity, overheat, and overcurrent conditions. Stable operation supported by onboard high-capacity aluminum electrolytic capacitors and SMD ceramic capacitors to reduce ripple. Supports battery charging via solar panel or USB connection. Compatible with 6V~24V solar panels using DC-002 jack input or screw terminal input. Onboard MPPT SET switch allows selection of levels close to input level to improve charging efficiency. Provides two 5V output interfaces: pin headers and USB port. Equipped with a 14500 battery holder and PH2.0 battery connector for connecting various 3.7V Li batteries. Includes several LED indicators for monitoring the status of the solar panel and battery. Overview: This solar power management module is designed for 6V~24V solar panels. It charges 3.7V Li batteries through solar panels or USB connections and provides a 5V/1A regulated output. The module features MPPT functionality and multi-protection circuits. Suitable for solar-powered and low-power IoT applications. Specifications: 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: 4.2V±1% Over discharging protection voltage: 2.9V±1% 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°C~85°C Dimension: 65.2mm x 56.2mm x 22.9mm Color: Blue Material: PCB Package Contents: 1 x Solar Power Manager. Other items not included. Note: The 14500 battery is not included.