Jwin JS-P35 Portable Mini Speakers for Computer/IPOD/MP3 Player/CD Player Detachable 2-piece portable stereo speaker system. Connects to any standard (3.5mm) headphone jack. (No Power needed) Speaker Type: 3" Dynamic Wide Range Drivers. Frequency Response: 100-16,000 Hz. Speaker Impedance: 8 ohms. Monitor Screen Magnetized. Unit Size 3.7x4.5x3 (LxHxD)-Portable speaker system is very lightweight