Active black stereo speakers with volume control and earphone jack. Power is supplied through a USB port from a PC or notebook. You can use it just about anywhere.
Key Features:

• Total RS 1 W 
• output power 3 watt RMS 
• driver unit: 50x90 mm 
• frequency response: 160 Hz ~ 20 KHz 
• signal-to-noise ratio: 80dB 
• crosstalk: 40dB 
• volume control 
• power supply: USB 
• audio in: 3.5mm plug 
• audio out: jack audio cable: 1.2 m 
• USB cable: 1.45 m