The Craving Vapor HexOhm 3.0 has a proprietary board that is rated for up to 30 amps and 180 watts. Minimum voltage is 3 volts and maximum voltage is 6 volts. The HexOhm 3.0 is made aluminum and ultem. Minimum resistance is 0.1 ohms. Ideal resistance is 0.2 ohms.