large size touch screen finger and pen write, infrared touch sizes available: ... without glove or a pen.Touch Technology: Infrared Touch Available size: 32",37",40", 42", 46", 47", 50", 52", 55", 58 ... °C)AltitudeUp to 3,000mLife TimeAt least 7-yearElectricalOperation VoltageTypical +DC 5V, +4.75V to +5.25VPower SupplyUSB, power ripple max ...