Technical Parameters :PC interfaceUSB connecting line(Universal Serial Bus port)For the computer and USB programming connectionPower Supply :USB The programming voltage enter from the USB port.Voltage:4.50V-5.25VMax Current:<500 m A(2.5W)Static Working Current:<500uA(2.5mW)Output Range :The following output is for the left and right ears of the hearing aid device cableCommon install battery,apply to left and right ears, 1.35V, 10/50m A (Current can be adjust by install the software )Programmable battery,apply to left and right ears, -3.50V to +3.50V, 30m A(Voltage can be adjust by install the software)Suitable Operating Conditions :Temperature : +5°Cto+40°C(41°Fto+104°F)Humidity : 30 to 90%,non-condensingPreheating Time: Atmospheric Pressure: 600hpa to 1060 hpaNotice : Operate product in the temperature enviroment under -20°C or over 60°C,might cause permanent damage to the product.Maintain and Sending Conditions :Temperature: -25°C to +70°C(-13°F to +158°F)Humidity: <90%,non-condensingAtmospheric Pressure: 500hpa to 1060hpa