Super power, compact size and comfortable to hold, you want it all? People always thought that strong power should match with large size, SMOK will say NO to that. The 350W output is the maximum output power on this device with its compact size. Powered by 4 x 18650 batteries, with a supported Micro-USB port for firmware upgrades (not for charging). When matching with the cloud beast TFV8, you will enjoy fantastic clouds.