E-SMARTER Multifunctional Pen Flashlight Graduated LED Penlight, Color Random Delivery, Style: Convex Head White Light

1. Detachable head, easy to install batteries2. The barrel is equipped with a scale and pupil size comparison chart3. With pen clip, can be clipped in the pocket, collar and other places, easy to carry4. Lightweight design, easy to use5. Bright light, power saving, environmental protection, durable6. Alloy button switch at the end, easy to operate.7. Battery spring contact, using physical reverse technology, to prevent oxidation / poor contact and other phenomena8. Material: aluminum alloy, resin9. Power supply: 2 AAA batteries (not included)10. Size: about 13.8 x 1.3cm11. Weight: about 18.4g