This ultra-small, portable MP3 speaker features a built-in subwoofer, delivering enhanced sound quality and an immersive listening experience. Unlike ordinary small MP3 speakers, this model provides improved bass response and balanced audio performance, with automatic adjustment of treble and bass for optimal sound output. The speaker has a compact, heavy-duty design with a metal-reinforced construction that minimizes vibration during playback, especially at high bass levels, ensuring clear and stable sound. Its appearance resembles a traditional guitar amplifier, offering a similar weight and aesthetic while maintaining modern functionality. It can be used as an external audio player and supports connection to iPod, iPhone, Walkman, MP3 players, PSP, and other devices via a standard 3.5mm mini jack. Power options include 3 AA batteries (not included) or USB power from a computer. Volume control is simple and intuitive, mimicking the operation of a physical amplifier. Users can easily select preferred sound settings by turning the control knob. Ideal as a computer speaker, it can be powered directly via USB cable. Specifications: - Frequency range: 200Hz to 15,000Hz - Output power: 5W - Impedance: 4Ω - Sound pressure sensitivity: 115dB ± 15dB - Input: Standard 3.5mm jack - Power supply: USB or 3 AA batteries (not included) - Dimensions: 10 x 12.5 x 9 cm - Material: ABS + metal - Color: Black Package includes: 1 x Speaker Note: The actual product color may vary slightly due to lighting and display differences. Measurement tolerance is +/- 1-3 cm.