... mould; 2.portable power:3W 3.popular price for mass. 4.for laptop,mp3,mobile,PC... 5.OEM glass high-quality fancy vibration ... is very small and is used to furnish audio frequency for PC,music mobile phnone,Mp3,Mp4,CD,palm players and other ... .1)Power:5V/1000mA adapter or 5V USB port from PC/MAC2)Audio interface:Mini USB port3)Frequency range:80Hz~18KHz4 ...