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12 % OFF
12% off sitewide.
CODE: UK12
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12 % OFF
12% off sitewide.
CODE: UK12 -
18 % OFF
Prefilled Vape 18% OFF
CODE: PF18 -
14 % OFF
Reusable Vape 14% OFF
CODE: DP14
Frequently Bought Together
Frequently Bought Together
Product Details
Keystone Flex-3 40K Prefilled Pod Kit
Keystone Flex-3 40K Kit INTRODUCTION
Introducing the Keystone Flex-3 40K, the world's first 40,000-puff prefilled pod kit with dual mesh coils. This vape features a detachable 1100mAh battery with three power levels (up to 40W) and precise airflow control for loose or tight MTL vaping. The transparent tank reminds you of how much e-liquid is left, while the digital screen displays real-time battery level and wattage, reducing your power anxiety. Moreover, the device is equipped with a child-proof lock. Portable, convenient and user-friendly, the Keystone Flex-3 40K is your ideal choice whether you're an experienced vaper or just stepping into the vaping world.
Features
• Size: 88×55×25mm
• 1100mAh Rechargeable Battery
• Adjustable Output: 22W-28W-40W
• Visible E-liquid Tank with Light Bar
• Sytek Dual Mesh Coils (0.6ohm)
• 100% No Leakage
• 1s Quick Pod Switch
• Airflow Control: Loose / Tight MTL
• Digital Screen: Battery Life & Wattage
• Compatible With Keystone Flex-3 40K Prefilled Pod
• Child-proof Lock Button: Click 5 Times in 1.5s to Lock / Unlock the Vape
• Type-C Charging Port
Flavour Options
• Sour White Gummy
• Watermelon Ice
• Peach Ice
• Apple Ice
• Blue Razz Ice
• Berry Bliss
• Miami Mint
• Cool Mint
• Blueberry Watermelon
• Lemon Heads
• Sour Mango Pineapple
• Strawberry
• White Grape Ice
• Cream Tobacco
• Mango
1 x Keystone Flex-3 40K Device (Battery with Random Colour: Black / Green)
1 x Prefilled Pod
1 x User Manual


Attention: As the manufacturer needs the serial number to provide a replacement, we highly recommend you keep the original packing box or take a picture of the code before discarding it. Thank you!
FAQS
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How Do I Turn The Keystone Flex-3 40K Kit On Or Off?
Click the main button five times in quick succession to power the device on or off.
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How Do I Adjust The Power Of Keystone Flex-3 40K?
The Flex 3 offers three adjustable power settings 22W 28W and 40W allowing you to switch between them to fine tune both flavour strength and vapour output.
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Is Keystone Flex-3 40K Refillable Or Prefilled?
It mainly functions as a prefilled pod kit, but certain versions are also sold as refillable, with a 10mL capacity that allows at least two refills.
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How Many Puffs Does the Keystone Flex-3 Kit Have?
It is marketed as delivering up to 40,000 puffs vape, which contains one prefilled pod, vapers do not need to refill any more. The final puff count depends on the device’s lifespan and the user’s vaping habits.
Reviews
Customer FAQS
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SortMost Helpful Newset Highest Rating Lowest Rating
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ImagesAll With Images
Brandon S
04/13/2026Recommendation Status: Yes, would recommend
Easy Of: Easy
Jane
04/10/2026Recommendation Status: Yes, would recommend
Easy Of: Easy
Henryk
04/10/2026Recommendation Status: Yes, would recommend
Easy Of: Easy
Questions You May Want to Know:
- What else do i need to buy together? e-juice, coils or cartridges?
- Are these coils/cartridges compatible with ...?
- Which color do you recommend?
- Is this vape device durable?
- Are this vape device good for nic salts?
- Will the xx fit on this?
- Dear customers, here is the place to discuss the questions about the product. If you have any questions about your order or the arrival of goods, please contact our customer service. Thank you!
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