Essentially, they are AIO vapes that have heating chambers instead of atomizers, and they use high temperatures to heat dry herb, not burn them. The temperature suite is powered by an integrated battery that's usually located at the bottom of the device. In terms of operating them, they usually have main-button activation, and everything is controlled via side buttons or the main one. In some cases, you'll have an LED screen with a touchscreen that helps you choose your preferred settings, but it's rare for a vape pen due to its size.