Material: aluminum alloy LED color: Bright White Shell color: sliver,blue,purple,black,green,red Push-button on/off switch, easy to control. Power:2*AAA battery(battery not include) The dots on side are part of a pupil gauge to help determine the size of a patient's pupil when doing a neuro assessment. LED Medical Penlight with push top on and off switch, metal pocket clip, easy to use and carry. High quality aluminum alloy body and sleek appearance, give u pretty good texture and feels, very sturdy and durable. Small and compact design,make nursing penlight great to have on hand, also easily fits in your pocket,bag and First aid kit etc. The design of LED convex bulb, bring you much nice bright white light that isn't blinding than concave bulb. 1x LED Medical Pen light