A receiver is configured for canceling intra-cell and inter-cell interference in coded, multiple-access, spread-spectrum transmissions that propagate through frequency-selective communication channels. The housing has an image pickup window. The paper blocking element includes a connecting portion, a paper blocking arm, a pivot rotatablely connecting the cover. The dielectric layer includes a first dielectric region with a first dielectric constant and a second dielectric region with a second dielectric constant that is greater than the first dielectric constant. The ink supply port sealing cap includes: a first cap portion that seals the fist ink supply port; a second cap portion that seals the second ink supply port; and a coupling portion that separably couples the first and second cap portions. An pulse oximeter probe carries a light source such as LEDs or lasers which is used to read patient identification information carried on the patient’s wristband by a bar code.