Abstract: A battery charging system for a communication device comprises a housing; a charging circuit positioned within the housing; an electrical prong pivotally coupled to the housing, wherein the electrical prong comprises a protrusion positioned at a base of the prong, the protrusion sized to produce an interference fit with the electrical outlet; and an electrical connector at least partially protruding from a bottom surface of the housing, the electrical connector configured to engage a mating electrical jack of the communication device to enable charging of the communication device.

Abstract: A key card holder having a detachable card. The card may comprise a postcard with pre-paid postage or the postcard may include a voucher for free postage and mailing. A removably attached writing implement may be provided. The detachable card may further comprise a coupon, survey, map, checkout form, or an advertisement. Another aspect includes a hotel check-in kit comprising a key card and a postcard.

Abstract: A postcard having a writing implement attached thereto, such that the postcard and writing implement may be sold as a single unit. The postcard may further include prepaid postage for mailing to anywhere in the world. The invention further includes a multi-pack set of postcards having a detachable writing implement.