Product FAQ for SEENDA COE64-3 Pro

①Charge fully – plug in until the indicator turns solid green (mouse: underside between buttons; keyboard: the flash pattern indicator).

②Pick the right channel and re‑pair:

For 2.4G:

Keyboard: Remove the USB receiver, turn off the keyboard (switch the 2.4G channel before turn off), then hold down the ESC and 3 (in the main key area) keys for 2 seconds simultaneously, turn the keyboard on, see if the 2.4G channel light will flash quickly, indicating that it has entered pairing mode. Then quickly insert the USB receiver and bring the keyboard close to the USB location. The flashing will stop when pairing is successful.

Mouse: Remove the USB receiver, turn on the mouse, press the channel selection button on the bottom of the mouse briefly to select the 2.4G channel, then hold down the left button, scroll wheel, and right button for 5-8 seconds simultaneously. After releasing, observe the corresponding indicator light flashing quickly, indicating that it has entered pairing mode. Quickly insert the USB receiver and bring the mouse close to the USB location. The flashing will stop when pairing is successful.

For BT:

Keyboard: Turn on the keyboard, press the Bluetooth channel button briefly to select the Bluetooth channel, then hold down the same Bluetooth channel button for 5-8 seconds until the indicator light flashes quickly. Finally, find the keyboard in the device's Bluetooth list and connect it.

Mouse: Press the channel selection button on the bottom of the mouse briefly to select the Bluetooth channel. The corresponding channel indicator light will flash slowly. Hold down the channel selection button for 3-5 seconds again, and observe the corresponding indicator light flashing quickly. Finally, find the mouse in the device's Bluetooth connection list and connect it.

③If you still can’t connect, try the other connection method (Bluetooth vs. 2.4G) to rule out a fault with one radio.

①Please try the following steps according to the different connection channel:

For 2.4G USB connection

• Move the device closer to the USB receiver or computer. Unplug other nearby USB receivers or wireless adapters.
• Charge fully (green light). Low battery can cause intermittent cutouts.
• Re‑pair using the steps above.

For Bluetooth connection:

• If you’re on a Mac/iPad, fully charge your mac device and wait a moment after startup cause the Bluetooth system on Mac or IOS may need a few seconds to initialize fully.
• Try to forget the previous connection history and connect again to see if this works. If possible, try to forget all other keyboard/mouse connection history on your device

②It is also recommended to fully charge the product again and try another connection channel (2.4G VS Bluetooth) if you are using Windows system.

Turn the device off, charge it fully, then turn it back on. Firmly press the stuck channel button or a different channel button.

Charge until the green light is solid. Turn the switch on, select the channel you’re using (2.4G or BT), and press any key. If the indicator light flashes, re‑pair the product and see if this works.

On my Mac, the Option and Command keys are reversed, or copy/paste shortcuts don’t work

This keyboard only auto‑detects the system when connected via Bluetooth. If you’re using the 2.4G receiver with a Mac, the keyboard defaults to a Windows layout (swapping Option/Command). Connect using Bluetooth for proper Mac key mapping.

①Fully charge the keyboard, then re‑pair.

②For a single stuck or unresponsive key, press it firmly and hold for 5–7 seconds. This can re‑seat the internal switch or clear debris.

③If the problem is a specific key typing extra characters (e.g., pressing “P” types “89p:”), try a to connect the keyboard via another channel to see if this works.

①Make sure your computer’s keyboard language/layout is set correctly.

General Operating system settings:

On Windows, go to Settings > Time & Language > Language & Region>Switch the correct language layout.

On macOS, go to System Settings > Keyboard > Input Sources>Add the Correct Language layout(The selected logical layout is listed here.)

②If you’re using 2.4G on a Mac, switch to Bluetooth.

Press the key forcefully for 5–7 seconds. Clean around the keycap with compressed air or a gentle brush. If the keycap has come off, check for broken plastic clips – if intact, press it back down until it clicks.

We don’t sell individual keycaps. If the key still works and the clips aren’t broken, snap it back into place. If the hinge or clip is damaged, contact support with your order number and a photo for warranty options.

In this case, it may be because your mobile phone is not configured to allow input from an external keyboard. Please follow the steps shown in the screenshot to adjust the settings and then try again:

First, ensure that the keyboard is successfully connected to your mobile phone, then go to Accessibility > Settings > Full Keyboard Access and enable Full Keyboard Access.

The USB dongle is stored inside the cover on the bottom of the mouse. Remove the cover to access it.

We don’t sell standalone USB receivers. If you lost the receiver, you can still use the keyboard/mouse via Bluetooth. If your computer lacks Bluetooth, a standard Bluetooth adapter will work.

①Please check the charging indicator instruction for this model first, there should be a red indicator when plugged in for charging

For the Mouse: Light on underside between the left/right buttons – red blink = low battery, solid red = charging, solid green = full.

For the Keyboard: flash button indicator which is upside the numpad – red blink = low battery (channel lights also flash), solid red = charging, solid green = full.

②If no red light appears when plugged in, or the light never turns green after 2 hours, try a different USB‑A to USB‑C cable and plug it directly into a computer USB port. Avoid fast‑charge wall adapters; they may not be recognized.

It is recommended to try another cable to fully charge the keyboard/mouse via a computer USB port, the charging indicator will turns green when fully charged and usually it takes about 2-4 hours.

For keyboard:

When the backlit is off, the abnormal usage time should be around 300 hours

When the backlit is on, the abnormal usage time should be around 15 hours(100%)/28 hours(60%)/55 hours(30%)

For mouse, the abnormal usage time should be around 100 hours

①Make sure the keyboard is fully charged (a solid green charging light means 100%).

②Press the FN and SHIFT(right) keys once to turn/on/off and adjust the backlit level. There are 4 brightness Level: 0%-30%-60%-100%.

③Meanwhile, it is recommended to check if the single FN and SHIFT(right) keys to see if they are separately working or not via this link: keyboardchecker.com

④If it still won’t light up, try connect the keyboard via another channel or device and try the FN+SHIFT(right) keys again.

①Press FN and SHIFT(right) keys to turn on/off and adjust the backlit level;

②Press the Lightbulb(next to F12) key to switch backlit modes. This keyboard has seven backlit modes: Red / Yellow / Blue / Green / Orange / White / Purple

①Make sure the keyboard is fully charged (a solid green charging light means 100%).

②If it still won’t working normally, turn the keyboard on, then try to repair the keyboard or connect with another device. After that, connect the keyboard and try the FN+SHIFT(right) keys again to adjust the backlit level.

①Make sure the keyboard is fully charged (a solid green charging light means 100%).

②If it still won’t working normally, turn the keyboard on, then try to repair the keyboard or connect with another device. After that,, connect the keyboard and try click the Lightbulb(next to F12) key again to switch the color.