Flexzion Solar Charge Controller 10A Panel Battery Regulator 12V 24V Autoswitch Safe Protection For Street Lamp Base Station System Environment Monitor Charging Wifi Hotspot Etc 12/24V Auto Switch Solar Controller, automatic detection of the voltage. Prolong the battery life cycle and keep the load work well Overloading & short-circuit protection. Reverse discharging & reverse-polarity protection Under-voltage and over-charging protection. Protection from lightning strike Easy to set up and operate. Thunder protection. Suitable for small solar energy system The controller will automatically compensate the temperature of the charging voltage according to the changes of ambient temperature