Innokin Cool Fire IV Express Kit
5.00 out of 5
1 review
The CoolFire IV vapes perfectly with the Innokin iSub Apex & iSub-G Sub Ohm tanks.
Cool Fire IV:
  • Powerful! Fires 6 – 40W! / 3 – 7.5 V with a Maximum Output of 14.5Amp!
  • Compact: Only 86mm / 3.93” Tall!
  • Long lasting: 2000mAh hour battery!
  • Beautiful: Initially available in 6 vibrant and lasting finishes.
  • Intelligent: Vape Timer, Puff Counter, Integrated Short Circuit protection, Left/Right Screen Orientation, 15 Second cutoff & more.
  • Precise: RMS DC current accurate to a power deviation of 0.5W and fires resistances from 0.2 – 3.1Ohm.
  • Easy to use: 3 Buttons for Total, Precise, and Comfortable Control.
  • Always Ready: Charge the CoolFire IV with a standard Micro USB cable and vape at the same time with Innokin’s ‘Vape while charging’ technology.
  • The Cool Fire IV features a greater range of Variable Voltage, Variable Wattage, advanced safety features, portable electronics charging capacity and also ‘Vape while charging’ Technology.
The Cool Fire IV has a flush 510 connection with a spring loaded positive pin, durable stainless steel threading, an included ego adaptor. The Cool Fire IV has a variable voltage range of 3.0 – 7.5 volts adjustable in .1 volt increments and a variable wattage range of 6.0 – 40.0 Watts, adjustable in .5 watts increments. The Cool Fire IV uses Vrms DC current and is very accurate with a power deviation of 0.1Watt. The full 40 Watts is precisely maintained between resistances of 0.3 to 2.5 Ohms. There is no wasted power and exact accuracy means you are always vaping the power level that you choose. Vrms provides superior precision in delivering the exact wattage Ohm’s Law requires and stable power means better vapor. The high quality OLED screen looks great and clearly displays the resistance of the attached tank & coil, voltage, wattage and also accurately shows the remaining battery charge. The Primary Features of The Cool Fire IV
  • Battery Level Indicator: The Cool Fire IV battery capacity is displayed via green, yellow and red LED lights. Green = Almost fully Charged. When the Cool Fire4 is fully recharged the LED light will power off. Yellow = Half Power. Red = Low Power. Charge the Cool Fire IV
  • Variable Voltage: Voltage can be adjusted from 3.0 – 7.5 volts in .1 volt increments.
  • Variable Wattage: Wattage can be adjusted from 6.0 – 40.0 Watts in .5 watts increments
  • ON/OFF Battery Switch
  • SAFETY :15 second cutoff
  • Low Voltage Warning
  • Short Circuit/Atomizer Protection
  • Over-Discharge Protection
  • ‘Vape while charging’ Technology
  • Remembers last Voltage or Wattage setting
  • Overheat Protection
Please Note: Tank is not included in the Kit.
Rated 5.00 out of 5 based on 1 customer rating
(1 customer review)



The Innokin Cool Fire IV Express Kit is the newest and most compact, intelligent and powerful vaporiser from Innokin Technology. Featuring the most advanced integrated vaping technologies to create the perfect compact Sub Ohm E-cigarette. With 40W of vaping power, the CoolFire IV fires a full range of tank resistances and each is made with the highest quality materials to create a vaporiser that you can rely on!

With 40W of power, the Cool Fire IV can support a wide variety of atomizers.  The Cool Fire IV features a 2000mAh lithium-ion battery. It has a bright OLED screen. It also has user-friendly menu operation. The device is extremely well-built, with a beautiful finish. It has an ergonomic design that is very comfortable to use! It is best option for vapers looking for a powerful device.
The Innokin Cool Fire IV offers a number of safety features. The OLED screen starts flashing and the device stops firing if the power button is pressed for more than 15 seconds.
It has an ON/OFF battery switch at bottom of device. At the side, 3-Click ON/OFF power/firing button is located.
The device also monitors battery voltage. It will automatically power off if the battery is over-discharged. Its vape timer displays in seconds in real time.
The remaining battery life displayed via the LED power button. When powered on, the lights color indicates current battery level. GREEN = almost fully charged, YELLOW = half power remaining, RED = low power, needs to be charged.

Innokin Cool Fire IV Express Kit Features.

  • Variable Wattage: from 6.0 – 40.0 W in 0.5 W.
  • Variable Voltage: from 3.0 – 7.5 V in 0.1 V
  • Minimum atomizer resistance is 0.2 ohms.
  • Maximum atomizer resistance is 3.1 ohms.
  • Vrms DC current.
  • Vape Timer and Puff Counter.
  • Battery Level Indicator.
  • 15-second Safety Cutoff.
  • Short Circuit/Atomizer Protection.
  • Low Voltage Warning.
  • Over-Discharge Protection.
  • Overheat Protection.
  • Flip OLED Screen Orientation.
  • Pass-through “Vaping While Charging”.

Innokin Cool Fire IV Express Kit Specs

  • Operating Voltage: 3.0V-7.5V.
  • Operating Wattage: 7.0W-40.0W.
  • Battery: 2000mAh.
  • Standby Current: 100uA max.
  • Max Output Current: 12A.
  • Atomizer resistance: 0.2 ohms minimum (0.3 ohms recommended).
  • Charging: Micro USB DC5V/1A.

What is in the Package?

  • 1 x Cool Fire IV.
  • 1 x Micro USB charge cable.
  • 1 x eGo adapter.
  • 1 x Instructional Manual.
  • 1 x Plastic case to store in when not in use.

Additional information


Black, Blue, Red, Silver


  1. Rated 5 out of 5


    It’s really handy.!

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