[Chance for a Full Refund!] Arriving on CAMPFIRE at 12 PM on Monday, April 27: The Magic that Transforms Ambient Listening | 'Bone Conduction × Air Conduction' Dual Driver Earphones
The 'OpenDual' hybrid earphone, featuring bone and air conduction, IPX8 waterproofing, and 32GB of storage, launches on CAMPFIRE on April 27 with a full refund campaign.
📋 Article Processing Timeline
- 📰 Published: April 25, 2026 at 01:36
- 🔍 Collected: April 24, 2026 at 17:02
- 🤖 AI Analyzed: April 24, 2026 at 21:35 (4h 33m after Collected)
[Project Launch Date and Time] Monday, April 27, 12:00 AM
[Project Page] https://camp-fire.jp/projects/934632/view
Go to the project page
Pre-register now to get up to 50% OFF!
From April 27 (Mon) to April 30 (Thu), we will hold a [Full Refund] campaign for 3 lucky backers chosen by lottery from those who [Favorite & Repost the X (formerly Twitter) post]!
✅ [Project Launch Commemoration Bonus Participation Conditions]:
1. Repost the following X post and add this official LINE account as a friend
Link X post: https://x.com/RJCLIFF3/status/2046156455569674333
Link Official LINE account: https://lin.ee/xoa4KKC
2. Click "Favorite" on the CAMPFIRE project page
Link: https://camp-fire.jp/projects/934632/view
3. Purchase this product between April 27 and April 30
4. Send a LINE message to us with "Earphone + X Account Name + CAMPFIRE Account Name"
*If you meet the above conditions, you will be eligible for the full refund lottery.
Meet "OpenDual"
To an endless world of music
"Opening up a new sense of hearing."
"I don't want to compromise on highs or lows!" "I want to fill every moment of daily life with the colors of music!"... "OpenDual" is the IPX8 waterproof bone conduction × air conduction dual-driver earphone that answers all these desires.
With proprietary technology that exceeds conventional wisdom, it achieves a hybrid sound of bone conduction (mid-to-high frequencies) and air conduction (low frequencies) while maintaining IPX8 waterproofing. It provides an unprecedented high-quality open-ear experience in any environment.
Bone Conduction × Air Conduction
Equipped with Dual Speakers
Revolutionary simultaneous equipping of bone conduction and air conduction speakers. Fusing the clear mid-to-high frequencies from bone conduction vibrations with the rich low frequencies from air conduction, it creates an immersive presence as if you were at a live concert venue.
From the depth of the bass to the delicate brilliance of the treble, it faithfully reproduces the details that were previously given up on in open-ear earphones that only featured either bone conduction or air conduction technology. It delivers the sounds that couldn't be reached before.
This is a groundbreaking earphone that overturns the common sense of conventional open-ear earphones.
*Please note that the color of "OpenDual" for this project will only be "Black" as shown in the product specification images.
Designed to minimize sound leakage, allowing you to use it with peace of mind even in quiet environments.
Highest Standard IPX8 Waterproof Performance
Fully Waterproof even at a Depth of 2m
Conventionally, achieving high waterproof performance has been considered difficult because air conduction requires ventilation holes. However, "OpenDual" overcomes this challenge with proprietary sealing technology and a special structure. It is a dual-driver earphone that achieves the highest standard IPX8.
It can easily handle sweat from exercise or sudden rain, and is fully waterproof even at a depth of 2 meters, making it perfect for those who want to swim while enjoying music.
Because of its high waterproof rating, you can wash it with water if it gets dirty, which is a great point that allows you to use it normally without worrying about dirt.
*IPX8 standard: A level where water does not enter even when submerged at a depth of 2 meters for 30 minutes.
Open-Ear Design That Doesn't Block Your Ears
Minimal Pressure, Maximal Comfort
Because you can enjoy music without blocking your ears, there is almost no feeling of pressure even when worn for long periods.
You can naturally hear surrounding sounds, making it comfortable for commuting or running.
Equipped with 32GB Internal Storage
More Freedom with Your Music
"I can't use it because I don't have my smartphone..."
That era is over.
You can enjoy music without a smartphone. With a large-capacity 32GB internal storage, you can save up to approximately 8,000 songs directly inside the earphones*. Therefore, there is no need to carry or connect a separate device like a smartphone when exercising, allowing you to dive into the world of music anytime, anywhere!
*Approx. 8,000 songs: Calculated as 4MB per song.
From April 27 (Mon) to April 30 (Thu), we will hold a [Full Refund] campaign for 3 lucky backers chosen by lottery from those who [Favorite & Repost the X (formerly Twitter) post]!
✅ [Project Launch Commemoration Bonus Participation Conditions]:
1. Repost the following X post and add this official LINE account as a friend
Link X post: https://x.com/RJCLIFF3/status/2046156455569674333
Link Official LINE account: https://lin.ee/xoa4KKC
[Project Page] https://camp-fire.jp/projects/934632/view
Go to the project page
Pre-register now to get up to 50% OFF!
From April 27 (Mon) to April 30 (Thu), we will hold a [Full Refund] campaign for 3 lucky backers chosen by lottery from those who [Favorite & Repost the X (formerly Twitter) post]!
✅ [Project Launch Commemoration Bonus Participation Conditions]:
1. Repost the following X post and add this official LINE account as a friend
Link X post: https://x.com/RJCLIFF3/status/2046156455569674333
Link Official LINE account: https://lin.ee/xoa4KKC
2. Click "Favorite" on the CAMPFIRE project page
Link: https://camp-fire.jp/projects/934632/view
3. Purchase this product between April 27 and April 30
4. Send a LINE message to us with "Earphone + X Account Name + CAMPFIRE Account Name"
*If you meet the above conditions, you will be eligible for the full refund lottery.
Meet "OpenDual"
To an endless world of music
"Opening up a new sense of hearing."
"I don't want to compromise on highs or lows!" "I want to fill every moment of daily life with the colors of music!"... "OpenDual" is the IPX8 waterproof bone conduction × air conduction dual-driver earphone that answers all these desires.
With proprietary technology that exceeds conventional wisdom, it achieves a hybrid sound of bone conduction (mid-to-high frequencies) and air conduction (low frequencies) while maintaining IPX8 waterproofing. It provides an unprecedented high-quality open-ear experience in any environment.
Bone Conduction × Air Conduction
Equipped with Dual Speakers
Revolutionary simultaneous equipping of bone conduction and air conduction speakers. Fusing the clear mid-to-high frequencies from bone conduction vibrations with the rich low frequencies from air conduction, it creates an immersive presence as if you were at a live concert venue.
From the depth of the bass to the delicate brilliance of the treble, it faithfully reproduces the details that were previously given up on in open-ear earphones that only featured either bone conduction or air conduction technology. It delivers the sounds that couldn't be reached before.
This is a groundbreaking earphone that overturns the common sense of conventional open-ear earphones.
*Please note that the color of "OpenDual" for this project will only be "Black" as shown in the product specification images.
Designed to minimize sound leakage, allowing you to use it with peace of mind even in quiet environments.
Highest Standard IPX8 Waterproof Performance
Fully Waterproof even at a Depth of 2m
Conventionally, achieving high waterproof performance has been considered difficult because air conduction requires ventilation holes. However, "OpenDual" overcomes this challenge with proprietary sealing technology and a special structure. It is a dual-driver earphone that achieves the highest standard IPX8.
It can easily handle sweat from exercise or sudden rain, and is fully waterproof even at a depth of 2 meters, making it perfect for those who want to swim while enjoying music.
Because of its high waterproof rating, you can wash it with water if it gets dirty, which is a great point that allows you to use it normally without worrying about dirt.
*IPX8 standard: A level where water does not enter even when submerged at a depth of 2 meters for 30 minutes.
Open-Ear Design That Doesn't Block Your Ears
Minimal Pressure, Maximal Comfort
Because you can enjoy music without blocking your ears, there is almost no feeling of pressure even when worn for long periods.
You can naturally hear surrounding sounds, making it comfortable for commuting or running.
Equipped with 32GB Internal Storage
More Freedom with Your Music
"I can't use it because I don't have my smartphone..."
That era is over.
You can enjoy music without a smartphone. With a large-capacity 32GB internal storage, you can save up to approximately 8,000 songs directly inside the earphones*. Therefore, there is no need to carry or connect a separate device like a smartphone when exercising, allowing you to dive into the world of music anytime, anywhere!
*Approx. 8,000 songs: Calculated as 4MB per song.
From April 27 (Mon) to April 30 (Thu), we will hold a [Full Refund] campaign for 3 lucky backers chosen by lottery from those who [Favorite & Repost the X (formerly Twitter) post]!
✅ [Project Launch Commemoration Bonus Participation Conditions]:
1. Repost the following X post and add this official LINE account as a friend
Link X post: https://x.com/RJCLIFF3/status/2046156455569674333
Link Official LINE account: https://lin.ee/xoa4KKC