Miracle Snail K50 Manual -

Most of the K50's secondary functions are accessed using the in combination with others: Lighting Controls: FN + 5: Change the backlight color.

You're looking for the manual for the Miracle Snail K50. Here is some general information and text that might be helpful: miracle snail k50 manual

The K50 uses "Fn" (Function) key combinations to manage media and lighting without the need for external software. Toggle Backlight ON/OFF Fn + F1 Open Music Player Fn + F2 Volume Down Fn + F3 Fn + F4 Mute Audio Fn + F5 Pause/Play Setup and Customization Most of the K50's secondary functions are accessed

If the device won't turn on, ensure it is fully charged and that you are holding the power button long enough. If the heat function isn't working, check if the battery is low, as the device may disable heat to preserve power for vibration. Toggle Backlight ON/OFF Fn + F1 Open Music