Product Description Material: Plastic Size: 7.2 * 7.0 * 7.0 cm Color: Black and Red Rated frequency: 3 (Hz) Rated power : 3 (W) Rated voltage: 5 (V) Expansion interface: USB interface Package content: 1 pair of portable notebook mini speakers 1. Small Size, Big SoundTwo speakers measuring less than 3 inches per side to output full, rich audio from your PC/Laptop/Notebook. 2. USB Powered Both speakers get all their power from the USB port in the cable, so you don't have to worry about finding an outlet or carrying an adapter around. 3. 3.5mm Audio Jack Nearly universal audio jack connects quickly to most PCs and mobile devices. 4. Volume Control More convenience with an in-line controller that allows you to quickly adjust the volume of the speakers without having to change the volume of your device. 5. Built for TravelThe compact shape and durable construction lets you hear sound almost anywhere. Fits great in your laptop bag, briefcase or book bag.