Features: Efficient Solar Charging:Utilizes CN3791 chip with MPPT technology to maximize solar panel energy conversion, ideal for outdoor devices in variable sunlight conditions. Provides optimal charging for 3.7V lithium batteries up to 4.2V. Smart Battery Protections:Features auto recharge and charging modes to extend battery life, effectively recovering over discharged batteries. Perfect for prolonged electronic device usage with 4.2V±1% precise voltages control. Easy Connectivity:Equipped with 2Pin /PH2.0 Interfaces for quick installation without tools, suitable for enthusiasts and technicians needing flexibility. Highly Speed Charging:Delivers stable 2A charging current with 300KHz switching frequency, meeting fast charging demands for power banks and mobile devices. Real Time Monitoring:Built in charging indicators display progress and completion, essential for outdoor users tracking battery levels during activities. Specifications: Component: PCB Size:Approx.45X20mm/1.77X0.78In Option Type:6V 9V 12V Output voltages: nominal 3.7V full junction voltages 4.2V battery Interfaces: 2pin PH2.0/ Solar panel most power point tracking function Charging current:up to 2A Switching frequency: 300KHz Constant voltages charging voltages: 4.2V±1% Constant charges current is set by external resistor Package Includes: 1pc CN3791 MPPT Solar Panel Charging Board (with Cable) note: Please allow 1-3cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.