1. two port 2.0 USB ,high speed upload and download 2. multifunctional card reader which suitable for SD.MMC 3. the DC port can dffer steady power supply under the special cindition 4 support window98/ME/2000XP.Mac OS,no need drive. 5 tridimensional mini speaker and cool LED blue light, inside high quality microphone with "PTT" function you can enjoy the happy working life