Description Housing is made of alloy; this pen shape flashlight is durable, solid and sturdy. It shapes like a pen with clip for you to clip on pants, pockets, backpack and other place, which means you can carry it with you easily. Powered by 2pcs No7 battery(not included). Feature - Color: Random color. - Material: Aluminum alloy. - Size: 13.50X1.30X1.30cm/5.31X0.51X0.51 inch. - Power: 2pcs AAA battery (not included). - Light color: Yellow. - Made of material, durable and safe to use. Integration design keeps dust and dirt out. - Unique small size shape design make it more easy to storage and use. - Our pupil gauge penlights are designed to be efficient and lightweight for professionals but are also suitable for at home consumer use. - Sealed concentric beam. Keep these important penlights at work, home, in your car, boat, or backpack. - The penlights with pupil gauge and a 5cm-ruler, helpful for you to measure the size of pupil dilation and body parts.Package list: 6 x penlights