Function USB 2.0 support . 16 bit sound card inside . No driver needed for Win98 SE/Win ME/ Win 2000/Win XP/ Mac OS(/Mac OS ) . HID support Adjustable volume for handset . Ring incall . Gloss Weight: 0.223 Kg Other Specification 16*15*5cm (L * W * H) ( Include Packing) . 40 pieces in one Carton . 41*33*27cm ( L * W * H), 10 Kg per Carton Support