The Target GiftCard is the retailing division's stored-value card or gift card. Target sells more gift cards than any other retailer in the United States and is one of the top sellers, by dollars and units, in the world. The unique designs of their cards contribute to their higher sales, as well as Target's policy of no expiration dates or service fees. Past and current designs include lenticular, "scratch and sniff" (such as peppermint during the Christmas season), glow in the dark, LED light-up, a gift card on the side of a bubble blower, a gift card that can function as a CD-ROM, and even a gift card that allows the sender to record a voice message. A current environmentally friendly gift card is made from bioplastic manufactured from corn. Target rolled out a new MP3 player gift card for the 2006 holiday season. It holds 12 songs and must be purchased with an initial value of at least $50. Beginning in January 2010, Target Stores rolled out Mobile GiftCards, through which one can produce a GiftCard barcode on any web-capable cell phone. This data matrix barcode can be scanned at a Target POS like any physical card barcode, and balances can be stored, retrieved, and gifted with the convenience of a cell phone. Some of these unique design ideas are patented, and these patents are assigned to the Target Brands subsidiary. For example, some such Target GiftCard designs feature a wooden front side. On May 24, 2005, the United States Patent and Trademark Office granted U.S. patent D505,450 for the "ornamental design for credit or stored value card with wood layer" to inventors Amy L. Lauer and John D. Mayhew. U.S. patent 7004398, for the "stored-value card assembly including a stored-value card, an edible product, and a wrapper", was granted to Michael R. Francis and Barry C. Brooks on February 28, 2006. Both patents have been assigned by their inventors to Target Brands, Inc.  Target GiftCards are also collector's items. Some of the first gift cards issued are valued at over $300 (even though the card doesn't have any money on it). Every year, Target introduces new Holiday GiftCards. In 2007, Target's Holiday GiftCards featured a wind-up flashlight, a musical gift card, a gift card that lights up, and a scented gift card. In 2006, "The Washington Post" revealed that Target is operating two criminal forensics laboratories, one at its headquarters and the other in Las Vegas.