Heine copy streak Retinoscope Rechargeable with free shipping Rotation and Vergennes movements are independently operated for those separate controls. Continuous 360 ° rotation for easy and accurate positioning of streak for axis determination Smooth Vergennes movement operated conveniently It Has a Smooth,Non-Abrasive Knurled Finished Its Comes With Rechargeable Battery In Handle Or That Can Also Be Converted For Use with Standard C-cell Batteries 1 Extra Bulb Free In The Case