Founded in 1979 by Noel Lee, Monster (originally Monster Cable Products) began in a San Francisco Bay Area garage where Lee hand-built what became the world's first high-performance speaker cable. The oversized 12-gauge audio cable earned the "Monster" name for its sheer size, and Lee sold it door-to-door before debuting at CES in Chicago. The company is widely credited with creating the premium audio cable market, convincing musicians, audiophiles, and retailers that cable quality meaningfully affects sound.

Monster's music product line centers on the Prolink series of instrument and microphone cables. The Prolink Rock, Prolink Bass, and Prolink Acoustic instrument cables are tailored to different playing styles and frequency ranges, featuring gold-plated connectors, multi-gauge wire networks, and the company's patented Time Correct windings designed to minimize signal loss. The Prolink Performer 600 and Classic microphone cables round out the stage and studio lineup. Beyond cables, Monster expanded into headphones — most notably engineering the original Beats by Dr. Dre headphones in partnership with Dr. Dre from 2008 to 2012 — as well as speakers, power conditioning, and consumer audio accessories.

Headquartered in Brisbane, California, Monster (rebranded from Monster Cable Products to Monster Inc. in 2012) distributes products in over 100 countries. The company has collaborated with artists including Dr. Dre, Lady Gaga (Heartbeats headphones), and Miles Davis's estate, and maintains a presence across professional audio, home theater, and consumer electronics categories.

Monster has 120 products cataloged on Equipboard, including Instrument Cables, Headphones & In-Ear Monitors, and Vocals. Their gear is featured by 53 artists, with the strongest followings in Rock, Electronic, and Pop. Notable users include Michael Jackson, Deadmau5, and Verdine White.