Features Extraordinary Sound Quality: The power amplifier is equipped with high-frequency electrolytic capacitors, noise reduction circuit design, no background noise, which can effectively gain audio and improve sound quality. Adjustable Volume: The power amplifier has a volume adjustment knob, which can freely adjust the volume according to the user's needs, allowing you to enjoy high-quality amplified audio. Aluminum Alloy Shell: The aluminum alloy shell of the amplifier is very strong, with good anti-interference and no signal loss. It's a nice mini audio component amplifier for a home audio stereo system. Portable and Compact: The power amplifier is small in size, easy to carry and use, and improves the sound quality of your device anytime, anywhere. Access digital sound controls with compact amplifier receiver power. Wide Compatibility: This amplifier is widely compatible with all audio equipment, and the input can be connected to DVD, CD, set-top boxes, MP3, TV, game consoles and other equipment. The output can be connected to speakers, subwoofers, headphones, etc. Specification: Item Type: Mini Stereo Audio Preamplifier Material: ABS and aluminum alloy Input: RCA (L/R) , 3.5mm Output: RCA (L/R) , 3.5mm , phone Power Supply: DC 5V Battery: 1000 mah 503450 lithium battery (built in) Compatible Input Devices: DVD, CD, set top box, MP3, TV, cell phone, computer, tablet, turntable, sound card, guitar, bass, electronic musical instrument, game console or other device. Compatible Output Devices: Speakers, Subwoofers, Sound Blasters, Reverbs, AV Receivers, Post Amplifiers, Headphones, etc. Size: Approx. 87 x 50 x 37mm / 3.42 x 1.96 x 1.45in Package List: 1 x Mini Stereo Audio Preamplifier 1 x USB Power Cable Package List 1 x Mini Stereo Audio Preamplifier 1 x USB Power Cable