Housing is made of stainless steel; this pen shape flashlight is , 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 rechargble battery, it does not need to change battery frequently. Feature - - Material: Stainless Steel. - Size: Approx. 13x1.3x1.3cm/5.1x0.51x0.51inch - Battery Type: Rechargable Li-ion battery - Battery Capacity: 270mAh - LED lifespan: about 40,000h - Power: 2W - Note: The USB cable is of random style. - High-strength stainless steel body. Specially processed case for extremely durability. - Integration design keeps dust and , powered by rechargable battery. - light, compact, solid structure makes it perfect for lighting. - Long sling at the bottom of the flashlight for easy hanging. - USB Charging , easy to match most of adapters on the market. Package list: 1 x Nurse Pen Light USB Rechargeable LED Flashlight Stainless Steel for Students Doctors 1 x USB Charging Cable