Fiber optics for cool, obstruction-free light transmission. 2.5V xenon or LED lamp for true tissue color or wide-angle swivel 2.5X viewing lens. Insufflator port (fitting and insufflator sold separately) for pneumatic otoscopy.  On/off power switch integrated into pocket clip, five Welch Allyn 2.75mm & 4.25mm specula,  & fitted hard. 2Yr Warranty.   #5111N-Each Latex Free  UNSPSC#42182005