Feature: 1. This product has built‑in microcontroller, one‑key setting, digital display, and automatic memory function. 2. Totally 4‑level PWM charging management, with large LCD display, all parameters are adjustable. 3. With double reverse current protection, low heat generation, built‑in short circuit protection, open circuit protection, reverse connection protection, overload protection. 4. Portable, easy to carry and use, dual USB output, can bring convenience to your life. 5. Easy to store, will not be obtrusive when placed at home, a good solar regulator, use it with confidence. Specification: Condition: 100% Brand New.Item Type: Solar Charge ControllerMaterial: ABSColor: BlueProduct Size: Approx. 13.6 x 7cm / 5.4 x 2.8in Rated Voltage: 12V 24V Automatic Current: 40A The regulator is just suitable for lead-acid batteries: For OPEN, for AGM, for GEL Not Suitable for: Ni-MH, Li-ion or other batteriesWeight: Approx. 154g / 5.4oz Package List: 1 x Controller1 x User Manual Note: 1. Please allow 0‑2 cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.3. Connect the battery to the charge regulator‑positive and negative. If a 12V battery is detected, it will display 1; if a 24V battery is detected, it will display 2.4. Connect the photovoltaic module to the regulator‑plus and minus.5. Users connect to the charging regulator‑positive and negative.6. The reverse order applies when uninstalling! Improper order will damage the controller.