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Coolfire 4 iSub Starter Kit


Product Description

The Coolfire 4 can push up to 40W of power while the iSub tank is capable of firing sub-ohm resistances as low as 0.3Ω and storing up to 4ml of e-juice.

Innokin Coolfire 4 Box Mod

The CoolFire series just got a major upgrade with the introduction of the Innokin CoolFire IV box mod.

The most compact, intelligent and powerful vaporizer from Innokin to date, the CoolFire 4 is packed with advanced technologies and features for the perfect sub-ohm vaping.

Don't let its size fool you – the Innokin CoolFire IV vaporizer delivers where it matters. Enjoy adjustable output from 3 to 7 volts or 6 to 40 watts. With a 14.5 amp limit, the CoolFire 4 is capable of firing atomizer resistances as low as 0.2Ω.

The Coolfire 4 uses Vrms DC current for increased accuracy with a power deviation of 0.1 watt. The full 40 watts is precisely maintained between 0.3 to 2.5 ohms which means no power is wasted while you vape on your preferred output.

Compared to other box mods, the CoolFire IV is super sleek with a high-quality feel. The shell is beautifully crafted from aluminum and zinc, making it one of the most lightweight, durable, and comfortable mods around. It fits right in the palm of your hand with a convenient on/off switch located at the base.

The high-quality OLED screen clearly displays the resistance of the attached tank and coil, voltage, wattage, and remaining battery charge.

A stainless steel threaded spring loaded 510 connector ensures a reliable connection with most sub-ohm atomizers on the market. An eGo adapter is included in the kit for more versatility.

Unlike the other Innokin devices, the CoolFire 4 has a built-in 2000mAh battery and offers a USB port for charging and pass-through functionality.

Innokin CoolFire IV Features:

  • Fires 6W-40W
  • 3V-7.5V with a maximum output of 14.5 amps
  • RMS DC current accurate to a power deviation of 0.5W and fires resistances from 0.2Ω-3.1Ω
  • Long lasting 2000mAh battery
  • 3 easy to use buttons for precise and comfortable control
  • Flip screen orientation
  • Vape timer
  • Puff counter
  • Vape while you charge
  • Integrated short circuit protection
  • 15-second cutoff
  • Low voltage protection
  • Over-discharge protection
  • Overheat protection
  • Compatible with Innokin iSub and iSub-G sub-ohm tanks
  • Available in 6 vibrant colors

Low voltage warning: the red LED and battery bar will flash when output dips below 3.3 volts.

Short circuit/atomizer protection: the CoolFire 4 protects itself from functioning in unsafe conditions when atomizers are shorted.

Automatic real-time ohms detection: if the resistance of the atomizer goes lower than 0.3, the ohms bar will flash and the Coolfire IV will shut down.

Output setting memory: the Coolfire 4 will remember the last voltage or wattage setting before it was turned off and will keep the same setting when turned on.


  • Operating voltage: 3.0V-7.5V
  • Operating wattage: 6.0W-40W
  • Standby current: 100uA max
  • Maximum output wattage: 40W
  • Maximum output current: 12A
  • Maximum output Voltage: 7.5V
  • Vrms power regulation
  • Battery: built-in 2000mAh high drain polymer li-ion rechargeable 18650 battery
  • Clearomizer resistance: 0.3Ω (recommend)
  • On/off switch at the base
  • 3-click lock/unlock
  • OLED display
  • Heat dissipation vents
  • Battery level indicator
  • Flip OLED orientation
  • Lanyard hole
  • Thread: spring loaded 510 stainless steel
  • Charging: Micro USB DC5V/1A
  • Dimensions: 3-3/8" (L) x 1-5/8" (W) x 1" (D)

The Innokin Coolfire IV is compatible with all standard 510 clearomizers and atomizers including the iClear16, iClear16B, iClear16D, iClear30, iClear30B, iClear30S, and Gladius-M.

Innokin iSub tank

The first sub-ohm tank from Innokin, the iSub is made of 100% stainless steel for extreme durability. Inside the tank is a German-made polycarbonate tube that can hold up to 4ml of e-liquid.

The No-Spill Coil Swap System has compartmentalized the coil and tube configuration to make coil changing a breeze. Dual adjustable air vents that are 12mm wide allow users to customize their vaping experience with just a few clicks.

The iSub tank comes with a pre-installed 0.5 ohm coil built with Japanese organic cotton for the purest and cleanest flavors. It can easily fire at high wattages to match Innokin's CoolFire 4 box mod.

Innokin iSub tank features:

  • Stainless steel construction
  • German-made polycarbonate tube
  • Japanese organic cotton
  • 0.5 ohm coil
  • 4ml liquid capacity
  • 12mm adjustable airflow slots
  • No-Spill Coil Swap System
  • Permanently attached mouthpiece
  • Wide bore drip tip
  • 510 threaded
  • Available in four colors: Clear, Gray, Blue, Pink


  • 0.5Ω iSub coil can fire 20W to 40W
  • 4ml e-liquid tank
  • 12mm x 3mm dual adjustable airflow vents
  • 22mm diameter
  • Dimensions: 2-3/8" (L) x 7/8" (D)

Package Contents:

1 x Innokin Coolfire IV box mod
1 x Innokin iSub tank with pre-installed 0.5Ω coil
1 x USB charger cable
1 x eGo adapter

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