... limiting charge mode 3.SD card function 4.Warranty 1 year 5.OEM Services TECHNICAL PARAMETERS: Product ModelWWS04- ... Current≤20 mAAmbient Temperature & Humidity Range-20~+55°C/35~85%RH(Without Condensation)Display ContentBattery Voltage, Wind ... (Optional)Auto SwitchTemperature Compensation Function (Optional)-4mV/°C/2V ,–35°C--+80°C,Precison:±1°CCommunication Mode (Optional)RS232,RS485,RJ45,GPRS ...