He did demonstrations comparing the audio of standard cables to Monster cables for retailers and trained their salespeople to do the same for customers. In 1980, Monster Cable Products moved out of Lee's garage and into a San Francisco facility. It also introduced its second audio cable, Interlink. The company grew through word-of-mouth and an increasing number of retailers that carried Monster products. It attempted to enter the market for audio devices for automotive briefly, but withdrew to focus on home entertainment. Its first product intended for the mass-market was introduced in 1987. Monster re-entered the auto audio market in the early 1990s with a new line of speaker cables and its first speaker product, the Persona One. Its high-end M-series product line was introduced in 1992. It also expanded internationally, especially in Asia. Monster had a Taiwanese distributor file its trademark in the region, which led to the distributor continuing to sell products under the Monster brand after their agreement with Monster was terminated. This led to a lengthy legal battle and eventually a settlement. Monster acquired the Entec in-car audio brand in 1998. Monster's program for retailers was formalized in 1993 as the M4 Dealer Success Program. The "M4" stands for four "M"s: Mix (product mix), Merchandising (displays), Monsterization (training) and Management commitment. In the 1990s, the business grew from $20 million in annual revenues to $100 million. By 1998, Monster was producing 1,000 different products out of a distribution and manufacturing center in Brisbane, California, that was established that year. It had created a record label company, Monster Music, in 1989, which was followed by Monster Power for power products such as power cords and surge protectors, in 1998, Monster Game for video game accessories in 2000 and the Monster Mobile division, which markets cell phone and digital camera accessories, in 2001. A Monster Photo product line was created in 2003 that includes power cells, cables and bags for digital cameras, followed by Monster Signature Series Power. In 2004, it created a spin-off called M-Design, run by Lee's son, which sells furniture with electronics built in. In September 2004, Monster paid $6 million in an agreement with the San Francisco 49ers and the city of San Francisco to rename the football team's home stadium from Candlestick Park to Monster Park for four years. $3 million of it was given to the football team and the other $3 million to the San Francisco Recreation and Parks Department. Critics of local politician Matt Gonzales said it was inappropriate for the city to sell the name of a public facility to a corporation, and a ballot was passed ensuring that the name of the park reverted to Candlestick Park in 2008.