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【Voltage Compatibility】
When using electrical appliances, please note that they are designed for Japanese voltage specifications (90-110V), so if you use them with a different voltage, it may cause a malfunction.
【Plug Type】
Our products use Japanese plug types (A or B type).
Please use a conversion adapter if necessary.
【Important Note on Transformers and Adapters】
A transformer adjusts voltage to match your device’s requirements.
A conversion adapter only changes the plug shape and does not adjust voltage.
Using only a conversion adapter without a transformer may result in damage to the product.
【Liability】
We are not responsible for malfunctions or damages caused by improper use, such as operating the product without a transformer.
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[IP68 Waterproof, Fully Wireless]: MASTJUST's newly developed bone conduction earphones, designed specifically for swimming, boast the highest level of waterproofing. Their IP68-compliant waterproof and dustproof construction allows them to withstand complete submersion up to 2 meters, making them ideal for swimming in the pool, as well as other water activities like surfing and SUP. Because they're fully wireless, there's no need for cables connecting the earphones to your audio device, so you can enjoy them comfortably with Bluetooth or MP3 playback. They're also sweat-resistant, so you can use them while running without any issues.
[Open-Ear, Comfortable Wearing]: The open-ear design provides a comfortable fit and secure hold, preventing pain and preventing slippage even in water. The bone conduction headset's ultra-lightweight body (28g) makes it comfortable to wear and prevents ear pain on land or in the water. Even when running, you can hear surrounding noises, such as cars and bicycles, for safer running, and you can even play music as background music.
[Bluetooth 5.3 & MP3 Mode]: These Bluetooth earphones feature both Bluetooth and MP3 modes. Simply double-click the power button to switch between MP3 and MP3 modes. They also feature 32GB of memory, allowing you to store up to 6,000 songs. (You'll need to connect to a PC to transfer music files.) This makes them incredibly lightweight and convenient for outdoor activities like running and swimming, eliminating the need to carry a smartphone.
[12-Hour Continuous Playback & Long-Lasting Battery Life]: These bone conduction Bluetooth wireless earphones feature a built-in 250mAh battery, allowing you to enjoy up to 12 hours of music and calls after a full charge in 2 hours. A 10-minute charge provides 1.5 hours of battery life, so you can quickly charge and use them even when you're in a hurry. Perfect for everyday activities like commuting to work or school, playing sports, gaming, running, and teleworking, as well as long bike rides and mountain climbing, you can enjoy a long day without worrying about sudden battery cuts.
[Multi-point function, excellent operability]: The multi-point function allows you to use it for both work and personal use. Pair it with multiple devices, such as your work computer and personal smartphone, and switch seamlessly. You can respond to sudden calls or meetings without panicking. It also features four physical buttons: a power button, volume +/- adjustment buttons, and a multi-function button, allowing you to easily skip/rewind songs, adjust the volume, and control calls. It offers excellent operability with comfortable one-touch control.
[Open-Ear, Comfortable Wearing]: The open-ear design provides a comfortable fit and secure hold, staying secure even in water. The bone conduction headset's ultra-lightweight body (28g) makes it comfortable to wear and prevents ear pain on land or in the water. Even when running, you can hear surrounding noises, such as cars and bicycles, for safer running, and you can even play music as background music. [IP68 Waterproof, Fully Wireless]: MASTJUST's newly developed swimming-specific bone conduction earphones offer the highest level of waterproofing, with an IP68-compliant waterproof and dustproof body that can withstand complete submersion up to 2m, making them suitable for swimming in the pool, as well as water activities like surfing and SUP. As these are fully wireless bone conduction headphones, there's no need for a cable connecting the earphones to your audio device, so you can enjoy comfortable listening with Bluetooth or MP3 playback. Of course, they're also sweat-resistant, making them perfect for running and other activities.
