Speculum attaches to fiber optic light head; no delicate or protruding light carriers to obstruct vision. Brilliant distal illumination is shadow free, without color distortion. For use with any Welch Allyn 3.5V or 2.5V power source and handle adapter or 6.5V handle and transformer.- Complete Illumination System includes Fiber Optic Light Head, Light Handle, Transformer & Insufflation Bulb (US Only) Stock Item