1. Support MPPT function, which can be by solar energy. 2. Efficient step-up and step-down automatic switching, automatic PWM and mode switching to achieve efficient step-up and step-down. 3. The product supports various protection mechanisms, such as over-current/over-voltage short-circuit/over-temperature protection, and is safe to use. Please note: the physical slightly color difference or difference, does not affect use, please do not mind, thank you! Product name: 100w bidirectional fast charging motherboard Application: 4.2V/4.3V/4.35V batteries with various specifications. Color:Blue Material:PCB Package Contents: 1 * Charging Module Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.