... medical equipment, Ticket vending machine, navigation device, hospital operating room, industrial equipment, large plasma display, indoor and outdoor ... SupplyUSB power supply (No external power supply needed)Operating VoltageDC 4.6V ~ DC 5VPower Consumption<1W, USB ... least a spare USB interface;Projection EquipmentNormal projector compatible.Operating Temperature-10 °C to 45 °COperating Humidity20% ...