Wireless headphones model i9s TWS remain one of the most popular budget solutions in the mobile accessories market, despite the emergence of newer versions. Their appeal stems from their compact case, automatic pairing and affordable price, making them an ideal choice for daily use with Android-based smartphones. However, the initial setup process often raises questions among users, especially if the device was previously paired with another gadget.
Correct synchronization is the foundation for stable audio signal transmission and correct operation of the microphone. The wrong sequence of actions can lead to the fact that the phone will see only one earphone or the connection will be constantly interrupted. In this material, we will analyze in detail the connection algorithm, ways to eliminate common errors and settings that will improve sound quality.
Preparing the device and checking the charge
Before starting the pairing procedure, it is critical to make sure that there is a sufficient battery charge level both in the case itself and in the headphones. Low energy levels may cause the Bluetooth module to malfunction, causing the device to fail to enter discovery mode or turn off during setup. It is recommended to leave the case with the inserted headphones on charge for at least 30-40 minutes before using it for the first time.
Visually check the condition of the contacts on the headphones and inside the charging box. Often dust or factory protective film accumulates on them, which prevents charging. If the LEDs on the headphones do not light up when you place them in the case, gently wipe the contacts with a dry, soft cloth. Make sure the magnets hold the headset tightly in place.
⚠️ Attention: If the indicator on the case flashes red even after charging for a long time, you may be using an adapter with a current higher than 1 Ampere, which can damage the power controller of budget models. Use a standard USB port on your computer or a certified 5V/1A charger.
You should also pay attention to the status indicators. Typically, when you open the case lid or remove the headphones, the LEDs begin to flash white or red-blue, signaling readiness for use. The absence of an indication may indicate a deep discharge or faulty battery.
☑️ Ready to connect
Activating the pairing mode on i9s
The key feature of the model i9s is the technology of automatic pairing between left and right earbuds. When removing both devices from the case, they must first find each other, and only then become visible to the outside world. This process takes from 3 to 10 seconds, during which the indicators can blink at different frequencies.
If you take out the headphones and they blink in turn or only one of them shows signs of life, it means that synchronization between them has not occurred. In this case, put them back in the case, close the lid for 5 seconds and remove them at the same time. Wait for the moment when one of the headphones stops blinking or blinks more slowly - this is a sign that the pair is formed and is ready to connect to smartphone.
What to do if the headphones do not synchronize with each other?
If automatic pairing does not occur, you must perform a manual reset. Press the touch zones on both headphones simultaneously for 5-7 seconds until they turn off (the indicators go out). Then press them again for 10-15 seconds until rapid flashing begins. After this, put the devices in the case and repeat the removal procedure.
In rare cases, forced entry into pairing mode is required. To do this, while holding the headphones in your hands, press and hold the touchpads on both devices for 5 seconds after turning them on. The indicators should start flashing quickly in red and blue, which means they are actively searching for a new device.
Setting up Bluetooth on an Android smartphone
The process of connecting to the operating system Android is standard for most versions, from 8.0 to 14.0, however, the menu location may vary slightly depending on the manufacturer's shell (MIUI, OneUI, ColorOS). The first step is to unlock the phone screen and go to the main settings menu.
Find the section responsible for wireless connections. In pure Android this is usually an item Connected devices, but in custom firmware it can be called Bluetooth directly in the main list or located inside the tab Other wireless networks. Make sure that the Bluetooth enable slider is activated and lights up blue or green.
After turning on the module, the phone will start an automatic air scanner. The name i9s TWS or simply i9sshould appear in the list of available devices. Click on this line to initiate the connection. The system will ask for confirmation of pairing - agree with it. A successful connection is usually accompanied by a voice message "Connected" in the headphones themselves.
| Action | Path to the menu (Stock Android) | Path to the menu (MIUI/Samsung) |
|---|---|---|
| Enable Bluetooth | Settings → Connected devices | Settings → Bluetooth |
| Search for devices | Automatically after switching on | Click "Search for devices" |
| Pairing | Tap on the name i9s | Tap on the name i9s |
| Checking status | Status "Connected" | Status "Connected" (media/call)" |
Troubleshooting connection problems
The situation when the smartphone sees only one earbud (usually the right one) is the most common problem for the model i9s TWS. This occurs due to desynchronization of communication channels between the left and right capsules. To solve this problem, you need to completely remove the device from the phone's memory.
Go to the Bluetooth settings, find it in the list of saved devices i9s and click on the gear icon or the "i" icon next to the name. Select option Forget the device or Cancel pairing. After that, turn off Bluetooth on your phone, put the headphones in the case and close it.
⚠️ Attention: Before reconnecting, be sure to delete the headphone profile from the memory of all devices to which they were previously connected (tablets, laptops, phones friends). Otherwise, when turned on, they may automatically connect to the old gadget, ignoring your smartphone.
After clearing the memory, follow the procedure for resetting the headphones themselves, described in the previous section (double long press until the indication is reset). Only after successfully restoring the connection between the left and right earbuds (when they stop flashing in turn), you can turn on Bluetooth on your phone and perform the search again.
Setting up controls and functions
The headphones i9s are equipped with touch controls that allow you to control the playback of music and calls without the participation of a smartphone. By default, the configuration of gestures may not be obvious, so it is worth remembering the basic commands for effective use.
A single touch on the touch zone is usually responsible for pausing or playing a track. Double-clicking most often switches the song forward, and triple-clicking back. However, in some firmware revisions the logic may be changed, for example, a long hold is used to call the voice assistant Google Assistant or reject an incoming call.
To call the voice assistant Siri or Google Assistant, try holding your finger on the touch zone of any headphone for 2-3 seconds. If it doesn't work, check the settings in the "Accessibility" section of your phone.
It is important to note that budget models do not have the ability to reassign gestures through the official application. All actions are hardcoded into the device’s microcontroller. If you are uncomfortable with the current arrangement of functions, the only way out is to get used to it or use third-party applications to emulate buttons on the phone screen.
Optimizing sound quality and latency
The quality of audio transmission in wireless headphones directly depends on the codec used and the distance to the transmitter. The model i9s TWS usually operates in the SBC standard, which provides acceptable quality, but may cause a slight audio delay when watching videos or playing games.
To minimize latency, try not to cover the phone case with your hand in the area where the Bluetooth antenna is located (usually the upper or lower part of the case). It is also recommended to disable the options related to the absolute volume level in the developer settings if you notice sound distortion at maximum volume.
To get to the advanced settings, activate the developer mode by clicking 7 times on the build number in the section About phone. Then in the menu For Developers find the item Disable absolute volume level and change its state. This may solve the problem of low sound or sudden changes in volume.
⚠️ Attention: The interface of the "For Developers" menu may vary depending on the version of Android and smartphone manufacturer. Do not change other parameters in this section if you are not sure of their purpose, as this may affect the stability of the entire system.
Frequently asked questions and answers (FAQ)
Why does the left i9s earphone not work or not charge?
Most often the problem lies in contact oxidation or contact debris into the charging compartment of the case. Try gently cleaning the contacts with a cotton swab dipped in alcohol. Also check that the magnet is firmly holding the earphone to the contacts. If the problem is not resolved, the battery of the left module may have failed.
Can i9s headphones be used one at a time?
Yes, most firmware versions support mono use mode. You can take out only the right or only the left earphone from the case, and it will automatically connect to the phone. However, this may require a preliminary reset so that the headphones “forget” each other.
How to reset the headphones to factory settings?
Remove the device from the Bluetooth list on your phone. Place the headphones in the case. Take them out and press the touchpads on both headphones at the same time for 20-30 seconds until the indicators blink several times and go off. After that, put them back in the case for 10 seconds and take them out for a new synchronization.
Why is the sound interrupted when walking?
This may be caused by radio interference from other devices (Wi-Fi routers, microwaves) or by the fact that the phone is in the back pocket of your trousers, creating shielding of the signal by the body. Try placing your smartphone in your chest pocket or front pocket of your jeans to improve connection stability.