No need speaker. It may empower any plane surface such as wooden table, glass, metal and rock etc. to send out music if there is music input. Special for  matching IPOD products but it still can input any foreign audio source like MP3,PC,CD,WALKMAN ext.
Product feature: •Upgrade version of I-MU. •Pure vibration speaker •Adapter simplified to an USB wire and an AC jack switch. It makes the bulk reduce a lot and you are free to choose the power supply mode—USB or AC. •LED light change to be blue. •Core device upgrade. The sound effect more wonderful. Parameter •In-put DC Voltage：5V •Static Currency：500mA； •Rated output power：2.5W •Max output power:30W Configuration •Gift Box,T2 •USB power wire •AC power switch •usage handbook