ag COTSUBU MK2 Wireless Earphones User Manual

1. Introduction

The ag COTSUBU MK2 is the latest model of the popular COTSUBU wireless earphones, known for their compact size, lightweight design, and excellent sound quality. With cumulative shipments exceeding 300,000 units, this new 2024 model features renewed colors, even clearer sound quality, and added functionalities.

The earphone body is an ultra-compact and ultra-lightweight type, weighing approximately 3.5g per side, making it the smallest and lightest in the series. It offers a comfortable fit that makes you forget you're wearing them. Its deep-fit design ensures a snug fit in any ear, preventing accidental drops, even when removing a mask. This design also provides high sound insulation, effectively blocking out ambient noise without the need for active noise cancellation.

Image: ag COTSUBU MK2 earphones and charging case in Mint color.

2. Package Contents

Please ensure all items are present in the package:

• COTSUBU MK2 Earphones
• Charging Case
• Earpieces (final TYPE E for TWS - SS/S/M sizes)
• USB-C Charging Cable
• Instruction Manual
• 12-Month Warranty Card

Note: Product packaging may change without prior notice. Depending on the time of purchase, you may receive a different product package. However, there is no difference in the product itself.

3. Setup

3.1 Charging the Earphones and Case

Before first use, fully charge the earphones and the charging case. Connect the provided USB-C cable to the charging port on the case and a USB power source. The charging time is approximately 1.5 hours.

Image: Mint colored COTSUBU MK2 earphones inside their charging case.

3.2 Pairing with a Device

1. Open the charging case. The earphones will automatically enter pairing mode.
2. On your device (smartphone, tablet, PC), go to Bluetooth settings.
3. Select "COTSUBU MK2" from the list of available devices.
4. Once connected, a confirmation sound will play.

3.3 Selecting the Right Eartips

The package includes final TYPE E earpieces in SS, S, and M sizes. Choosing the correct size is crucial for optimal sound quality and comfort. Experiment with different sizes to find the best fit that provides a secure seal in your ear canal.

Image: A woman wearing a pink COTSUBU MK2 earphone, illustrating the secure and comfortable fit.

4. Operating the Earphones

The COTSUBU MK2 earphones feature intuitive touch controls for various functions.

4.1 Basic Touch Controls

4.2 Touch Operation Disable Function

The COTSUBU MK2 includes a unique "Touch Operation Disable Function" to prevent accidental touches and allow for focused listening. To activate this function, tap either earphone 5 times consecutively. Once activated, all subsequent touch operations will be disabled. This also turns off announcement sounds and LED lights, making it ideal for situations where you want to concentrate on your content without distractions.

Image: A woman demonstrating the touch control feature on the ag COTSUBU MK2 earphone.

5. Maintenance

Proper maintenance ensures the longevity and optimal performance of your earphones.

5.1 Cleaning

• Regularly clean the eartips and the mesh part of the earphones to prevent wax buildup, which can affect sound quality. Use a soft, dry cloth or a cotton swab.
• Wipe the charging contacts on both the earphones and the case with a clean, dry cloth to ensure proper charging.
• Do not use abrasive cleaners or immerse the earphones in water.

5.2 Storage

Always store the earphones in their charging case when not in use to protect them from dust, dirt, and physical damage.

6. Troubleshooting

If you encounter issues with your COTSUBU MK2 earphones, try the following solutions:

6.1 No Sound or Intermittent Sound

• Ensure the earphones are fully charged.
• Check if the earphones are properly paired with your device. Try re-pairing them.
• Ensure the volume on both your device and the earphones is turned up.
• Clean the charging contacts on both the earphones and the case.
• If only one earbud has sound, try placing both earbuds back in the case, closing it, waiting a few seconds, and then taking them out again.

6.2 Pairing Issues

• Make sure Bluetooth is enabled on your device.
• Ensure the earphones are in pairing mode (open the case).
• Forget the device from your device's Bluetooth settings and try pairing again.
• Move closer to your device and away from potential interference sources.

6.3 Charging Issues

• Verify the USB-C cable is securely connected to both the case and the power source.
• Try a different USB-C cable or power adapter.
• Clean the charging contacts on the earphones and inside the case.

6.4 Fragility Concerns

Some users have reported concerns regarding the durability of the earphones over time, specifically with sound issues in one earbud or connection stability. While the product is designed for daily use, handle with care to prevent damage from drops or impacts. If issues persist, please refer to the warranty and support section.

7. Specifications

8. Warranty and Support

Your ag COTSUBU MK2 earphones come with a 12-month manufacturer's warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use.

For customer support, warranty claims, or technical assistance, please refer to the contact information provided in your warranty card or visit the official ag brand website. Keep your proof of purchase for warranty validation.

Image: Charging case with text indicating a 1-year warranty.