The Slim Clear has a clear plastic covering that shows off the internal components of the device, similar to the transparent electronics from the 90’s. The device is powerful with 400 mAh, which means it has great battery life. There are three flex temp options: 2.7V (blue LED), 3.3V (green LED), and 4.0V (red LED), click the button 3x to change voltage levels. Each Slim Clear includes a type-C charging cable for rapid charging.