Material: The pen light is made of high quality aluminum alloy body and high quality LED bulb, Design: With push button switch on top, easy to control, Convenience: Metal pocket clip, lightweight and portable, can be easily put into your pocket, COMPACT AND PORTABLE: This penlight is 5.3 inches long and powered by 2 AAA batteries (not included) Professional and efficient: The flashlight is equipped with pupil ruler and ruler chart on both sides, which is ideal for you to measure the pupil size and body of your patients product description feature ◆【PERFECT SIZE】: Very convenient pen light can be easily held in your hand. ◆【Metal Pocket Clip】: The cute clip design makes this pen light and very convenient to carry. ◆【High Quality Pen Light】: Using more durable and advanced metal materials, high quality aluminum alloy body instead of plastic. ◆【Easy to use】: Press the soft glue button to operate easily. Perfect size and very handy pen light fits easily in hand. Specification ◆【Material】: