These deluxe self-ampliied power-houses, driven by a Walkman, MP3 player, or Satellite Radio are the best-performing handlebar-mounted speakers you can buy anywhere, at any price. The amplifier circuits put out well in excess of 25 watts each, are sealed in epoxy to provide complete weather-proofing, and have been specially tuned for the high gain levels necessary to amplify even the smallest of Walkman/MP3 type devices. The speaker cones are also waterproof and will provide many years of service without damage from the weather. The speakers connect directly to your bike's 12V electrical system (no batteries are needed except for your personal music device) and all necessary wiring, mounting hardware and installation instructions are included.