Operational characteristics of a wireless input device are modified so as to balance performance and power conservation. Silver is used as the infrared radiation reflecting layer. The second prefetch buffer can thus be prevented from being rewritten even if a central processor outputs branch addresses frequently. In use, the electrically actuatable element can be adapted to expand to engage tissue and secure the distal end of the PEG tube to the tissue. A determining unit determines an amplitude of an analog signal based on the position information.