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 Contents: 1 pair of portable notebook mini speakers 1. Small Size, Big Sound: Two speakers measuring less than 3 inches per side to deliver full, rich sound 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. 3. 3.5mm Audio Jack: An almost universal audio jack quickly connects to most computers and mobile devices. 4. Volume Control: More convenience with a built-in controller that allows you to quickly adjust the speaker volume without having to change your device's volume. 5. Built for Travel: The compact shape and durable construction allow you to hear sound almost anywhere. Fits perfectly in your laptop bag, briefcase, or backpack.