A portable, flexible peritoneal dialysis system is disclosed. Therefore, the apparatus for voice modulation in a mobile terminal is able to protect the privacy of subscriber by modulating the voice of subscriber during speaking on the phone, and is able to prevent the telephone harassment. The copolymers comprise at least one alcoholic moiety derived from a diol, triol, or polyol. The light source emits infrared radiation, visible light radiation, and ultraviolet radiation. The barrier layer made from a material such as nickel-vanadium alloy is formed over the adhesion layer.