... from LCD display.3. Voltage limiting and current-limiting charge mode, ensures battery in the best charging status.4. PWM ... stepless unload mode, which burn the excess power, making the battery charging ... optional)4mV/°C/2V ,–35°C--+80°C , Precision: ±1°CCommunication Mode(optional)RS232,RS485,RJ45,GPRS. EtcProtection FunctionSolar reverse charge protection ...