This document is for HP Laser MFP 131a, 133pn, 135a, 135ag, 135r, 135w, 135wg, 136a, 136nw, 136w, 137fnw, 137fwg, 138fnw, 138p, 138pn, 138pnw, 1136w, 1139a, 1188a, 1188w, 1188nw, and 1188pnw printers.
note:HP recommends plugging the printer directly into a wall outlet.