Features: Full 3-stage PWM charge management. Short circuit protection, open circuit protection,over-charging protection, over-discharging protection. Reverse polarity protection for battery, solar panel and auto temperature compensation function. Automatically manage the working of solar panel and battery in solar system. Suitable for small solar energy system. Specification: Condition: 100% Brand New Charge Mode: PWM Mode Material: Plastic Main Color: Black Optional Model: 3S12.8V3A, 3S6V/12V3A Working Temperature: -30~55 Waterproof Grade: IP40 Size: approx. 5.2*6.8*2.3cm/2.05*2.68*0.91in Weight: approx. 38g/1.34oz Package List: 1 * Solar Charge Controller Note: 1. Connects the battery first and then the solar panels, finally connects the load, don't reverse the positive and negative poles.