... Have multiple interfaces, including Ethernet, USB, RS-232 serial port, cash drawer and etc. to ensure the extension of equipments; ... Li battery optionalOperating Temperature-10°C~+40°COperating Humidity15% to 85% relative humidityPower ConsumptionStandby, ≤ 5WWork, ≤ 30WOperating ... with care, is strictly prohibited to throw, collision, upside down, to avoid mixing with corrosive substances ...