Solar Charge controller : solar charger controller are UL 1741 certified,the solar charger controller compatibility with 12V 24V system.build-in industrial Micro-typecontroller, automatically manage the working of solar panel and battery in solar system. Dual USB output 5V/2.5A (max), to support mobile phone chargeing. Multiple Protection Functions: solar controller has short-circuit protection, open-circuit protection,reverse protection, over-load protection. Fully 3-stage PWM charge management, improve system efficiency and prolong the life span of the battery. For protecting the lifespan of your battery, once the voltage of the battery drop 8V, the solar controller will turn off automatically. Battery Type: The charge regulator is only suitable for lead-acid batteries: OPEN, , GEL, it is not suited for nickel hydride, lithium, Liions, or other batteries. For protecting the lifespan of your battery, once the voltage of the battery drop 8V, the solar controller will turn off automatically. LCD Display: Comes with a display that can clearly indicate the status and data, it can be conveniently switched modes and parameter configuration, suitable for home, industrial, commercial etc. Easy to Install and Operate: The charge controller should connect the battery first, then the solar panel, and finally the load! The disassembly sequence is contrary to the wiring order.Dual mosfet Reverse current protection, low heat production. ( Note: The charge controller will heat up when it is running. Please be careful to install the charger controller on a flat, well-ventilated place). Discharge Current:40A Colour:Blue + Black Material:PVC Size: 18 x 9 x 5cm Package Contents: 1 * Solar Charge Controller Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.