SAMSUNG-SMS-M50U-Laptop-Desktop-2ch-Stereo-Speaker-USB-Powered-3-5mm-50W-Black Space efficient compact design with modern and glossy surface style. Luxurious and clean high glossy design. Channel : 2ch, Drive Unit : 50mm x 90mm, Power : USB-Powered. Rated Output : 2W (1W x 2), Noise Rate : &gt;70dB. Total Output : 50W (PMPO), Frequency : 100Hz ~ 20Khz, Sensitivity : &gt;40dB.