The PowerBolt II is the first device to usher in the next generation of wireless batteries. Backwards compatible – Take your Flux Max, EXO, or Flux to the max with next-level intelligence. Tech Specs Our first, digital built-in menu to select settings Easily detachable and compatible with all wireless FK Irons machines (Flux Max, EXO, Flux) State-of-the-art motherboard that learns how you like to work, “senses” and adapts in real-time Native Killswitch connectivity and improved range Responsive eGive settings (0-3) Voltage and Hertz readout (adjust by 0.1V or 0.5V) Easily read battery life and built-in session timer Left- and right-hand screen orientation Battery firmware updates via the Darklab app Battery life: dependent on functional preferences*. *needle resistance, machine speed (voltage/hertz), and stroke Full charge in 2 hours when used USB-C charging cable (not included).