This pen light is designed with a built-in rechargeable battery. We equipped with the newest type-C to USB charging cable and you can charge the pen light at any time via power bank, computer, etc.<br> penlights always comfortable touch in your hands. pen lights with bright white light perfectly help you to do daily work.<br> This pen light can switch between white light and warm light modes according to your needs. The white light is suitable for checking nose, mouth, ears or as a flashlight for lighting, the warm light is suitable for checking eyes.<br> pen lights are made of premium material, making these pen lights durable and long-life using. It also comes with a pen cap to prevent damage caused by falling.<br> Essential light to check your children's sore throats, ears or noses.There are pupil gauge and a 5cm-ruler on the side of the penlight. It is helpful to measure the pupil dilation and length on using these penlights.<br> color:Black<br> Material:Stainless steel<br> size:13.8 x 1.8m<br> Package Contents:<br> 1 x Pen light<br> 1 x USB cable<br> Only the above package content, other are not included.<br> Note: Light reflection and different displays may cause the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm.