Features:

A521 with compact stylish heavy duty metal grill design is popular for home, office and any other type of entertainment. With its 6.5 inch bass driver and 4 inch full range driver, it lets you enjoy rich, deep bass, clear and quality sound. The volume and bass are easily adjustable when it in use.

• 4" full range driver for satellites and 6.5" bass driver for subwoofer
• Heavy duty metal grill design
• Plug & play USB/SD card reader
• USB/SD reader supporting MP3/WMA dual formats decoding
• Play/Pause, Next, Previous three buttons for USB/SD reader control
• Built in AVR (Automatic Voltage Regulator) for wide main operating voltage range 
• High efficient energy saving design for Low Power Consumption
• Side panel controls for volume and bass
• Green LED power on indicator

Specs:

• Power output: 16Wx2 20W (RMS)
• Satellite driver: 4" full range
• Subwoofer driver: 6.5"
• Frequency response: 120 - 20KHz (satellite) 20 - 120Hz (subwoofer)
• Signal to noise ratio: ≥ 65dB
• Separation: ≥ 35dB
• Dimension: W118xH180xD113mm (satellite) W252xH252xD268mm (subwoofer)
• Weight: 4.85Kg (net)