NB1520 MINI SPEAKER SYSTEMS Drive unit: 1.5" x2 (magnetically shielded) Portable multimedia speaker system, perfect for Notebooks Mount it easily to any Notebook PC or flat panel display Two high quality micro-drivers delivering powerful sound 3.5mm line input, connects to all types of portable PC, MP3 player, etc. USB power supply without using any batteries Color：Black gray

Technical Specifications Speaker type 1.5" x 2 Frequency Response 179×52×27mm Speaker Impedance 8Ω Power Supply USB , AC/DC Dual power supply Dimensions 179×52×27mm ( W×H×D)