Microlab MD312 Bluetooth Wireless Portable Stereo Speaker w/ 2.1 Speaker System for Tablet, Smartphone and Notebook(Black) Output Power: 4 Watt RMS Power Distribution: 2x 1.25 Watt + 1.5 Watt Frequency Range: 40Hz - 18kHz Speakers: 2x 2-Inch Tweeter Type, 3-Inch Woofer Type Interface: NIL (output), 3.5 mm Stereo Jack, Mini-USB Charging Port (input) Uniquely designed 2.1 speaker system in a single compact sound box Comes with alternative 3.5mm stereo connection to most media players and computer Total Power: 4 Watt RMS Tweeter Type: 2inch x 2 Input: 3.5mm stereo jack, mini-USB charging port Power: Lithium battery BL-5C