1980s was the decade of the intensive development of the Walkman lineup. In 1981 Sony released the second Walkman model, the WM-2, which was significantly smaller compared to the TPS-L2 thanks to "inverse" mounting of the power-operated magnetic head and soft-touch buttons. Sony applied the "Walkman" brand to some transistor radios starting with the matching blue SRF-40 FM Walkman in 1980, and added a radio to some Walkman cassette models starting with the model WM-F1 in 1982. The first model with Dolby noise-reduction system appeared in 1982. The first ultra-compact "cassette-size" Walkman was introduced in 1983, model WM-20, with a telescopic case. This allowed even easier carrying of a Walkman in bags or pockets. The first model with autoreverse was released in 1984. In October 1985, the WM-101 model was the first in its class with a "gum stick" rechargeable battery. In 1986 Sony presented the first model outfitted with remote control, as well as one with a solar battery (WM-F107). Within a decade of launch, Sony held a 50% market share in the United States and 46% in Japan. Two limited edition 10th anniversary models were released in 1989 (WM-701S/T) in Japan, made of brass and plated in sterling silver. Only a few hundred were built of each. A 15th anniversary model was also made on July 1, 1994, with vertical loading, and a 20th anniversary on July 1, 1999, with a prestige model. By 1989, 10 years after the launch of the first model, over Walkmans had been sold worldwide. units were manufactured by 1995. By 1999, 20 years after the introduction of the first model, Sony sold 186 million cassette Walkmans. Portable compact disc players led to the decline of the cassette Walkman, which was discontinued in Japan in 2010. The last cassette-based model available in the US was the WM-FX290W, which was first released in 2004. Marketing The marketing of the Walkman helped introduce the idea of "Japanese-ness" into global culture, synonymous with miniaturization and high-technology. The "Walk-men" and "Walk-women" in advertisements were created to be the ideal reflections of the viewing audience. Sony implemented a marketing strategy, hiring young adults to walk around in public wearing a Walkman, offering nearby people to test out the product. Sony also hired actors to pose with the Walkman around the streets of Tokyo as an additional form of promotion. A major component of the Walkman advertising campaign was