A cardiac rhythm management system provides both a safe maximum pacing rate limit and a physiological maximum pacing rate limit. The side-emitting LED package includes a substrate with an electrode formed thereon, and a light source disposed on the substrate and electrically connected to the electrode. Moreover, a corresponding method and an embossing unit are also disclosed. The printer unit also comprises a body 110 to which the printer is fixed and having a paper shed 3 in which the paper is stored, and a turning arm 140 assembled at one end rotatably with the body 110. Additionally, an n-channel TFT is formed by selective doping to form a low-concentration impunty region which adjoins a channel forming region, and a sub-region overlapped by the gate electrode and a sub-region not overlapped by the gate electrode, to also mitigate a high electric field near the drain of the TFT and to simultaneously prevent the OFF current of the TFT from increasing. The apparatus and method reduces unnecessary power consumption by cutting off power for driving a load if a predetermined control condition is satisfied in an electronic product operating for a long time.