Evolv Vapor’s famous DNA 30D board, genuine product in OEM packaging.
From the manufacturer:
The DNA system lets anyone build Evolv’s revolutionary power regulated technology into their own products. The DNA 30D is a power regulated digital switch-mode DC-DC converter for personal vaporizers. It offers controlled power from 7 to 30 watts, runs from a single lithium cell and includes protective features such as overcurrent, over and undervoltage protection and a thermal shutdown. It features a small OLED display, analog or digital user controls, power adjust lock, onboard buttons and synchronous rectification for maximum battery life and minimal heat generation.
Datasheet available here.