Disclosed are a silverplated reflecting film and a manufacturing method thereof. A method of venting a gas chamber within a medical device includes transferring gas between the gas chamber and an external environment of the device through a vent that is adjacent the body of the device. Additionally, the wrist portion is bent such that the hand portion is angled from the forearm portion with the palm surface being substantially horizontal. The power supply voltage generator may also generate a third power supply voltage at a constant level during both the normal and power saving modes of operation. The image mask is used to exclude the undesirable portion in the creation of the feature dataset for the target.