Features: Support common speaker or earphone, microphone hole. Microphone recording and Karaoke function,with LED indicator light shows the working Advanced digital technology.Multi-channel technology realizes dynamic sound. Dynamically rotating sound field. Freely switchbetween speaker and headphonemode. Free adjustment function of analogspeaker position. Convert analogsignal (microphone and CD, music, TV, broadcast signal, etc.) into digital signal and save function. Specifications: Chip: HFR8103 Interface:USB Material:ABS Size: approx 5.1CMX2.2CMX1.2CM/2x0.87x0.47in for :USBpure digital sound output,enjoy virtual audio tracks Support System: for Windows /2000/2003/XP/Win7Linux/WinCE(5.0 6.0)/Android2.1, 2.2, 2.3, 4.0) Features:23 acoustic field for protection modes, 16 rhythm for protection modes Package Includes: 1 PC x Mini USB to 3.5mm Audio Adapter note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-2mm error due to manual measurment.