Stereo Audio Booster With Volume Control + 20dB Gain Compact and mini stereo amp to boost low-level audio inputs and amplify stero signal level while maintaining the sonic quality for long cable run to the amplifier or receiver. 20dB of adjustable gain to boost low-level audio inputs to the level needed to drive amplifier or receiver properly. Excellent solution for matching the sonic level from iPod, MP3/MP4, iPad, Tablet, CD player and mobile devices with Hi-Fi system, audio receiver, computer, loud speakers. Exceptional signal quality and low-noise floor thus resulting in very high musical accuracy for listening and recording. Built-in high-end amplification circuits offers exceptional signal purity with ultra low-noise audio operation for outstanding performance. Used as amplifier for karaoke players or CD/DVD player to transform your stereo music to thrilled sound for party or outdoor events. Doubles as MP3/iPod or iPad booster with up to 20dB gain. Easy volume level control dial on the front panel. Provide an external way of volume control for any audio source device or stereo amplifier that has no output level or volume adjustment of its own. Compact and all-metal design for durability and shielding the electronics from electromagnetic interference with noise rejection. 110V AC/DC power adapter included.