A keypad is provided, which comprises a plurality of user actuated keys, wherein the keys are generally arranged in a grid having a plurality of rows and a plurality of columns. The method further includes detecting a decoding error associated with decoding the received first coded message block and, in response to detecting the decoding error, identifying a part of the first coded message block for which retransmission will be requested and a suggested retransmission setting. The pump draws blood from the inflow conduit and discharges it through an outflow conduit fluidly coupled to a second peripheral artery via another subcutaneous anastomosis connection. The coated steel product is useful as a substrate for flexible CuSe2 solar cells.