After the controller is powered on, it first identifies the battery voltage type. If the battery voltage is 18V, it is recognized as a 12V system. If it is above 18V, it is recognized as a 24V system. After identifying the system voltage, the user can point the remote control at the infrared receiver, press the desired battery type button, and the blue light will flash to confirm. The setting is completed without needing to restart the system. After setting the battery type, select the load working mode. The 24H mode keeps the load output powered on continuously (except in cases of low battery protection). Light control mode turns the load off during the day and on at night. Modes 1-13 turn the load on at night and delay turning off after 1 to 13 hours. The last two modes are designed for solar lighting systems, enabling automatic operation without manual intervention. To temporarily turn the load on or off, press the Manual (H) button to enter manual mode, then press ON/OFF to control the load manually. This function is typically used to verify proper load connection. This controller supports three types of batteries: 12V lead-acid batteries (including maintenance-free and open types), 11.1V lithium-ion batteries (3S, 3 x 3.7V, including capacity and power types), and 12.8V lithium iron phosphate batteries (4S, 4 x 3.2V). For 24V systems, it supports 24V lead-acid batteries (including maintenance-free and open types), 22.2V lithium-ion batteries (6S, 6 x 3.7V, including capacity and power types), and 25.6V lithium iron phosphate batteries (8S, 8 x 3.2V). Material: ABS Color: Black Package Contents: 1 x Solar Charge Controller Note: The package includes only the items listed above. Other accessories are not included. Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement may vary by +/- 1-3 cm.