Kinglucky F50

Kinglucky F50 Under Pillow Sleep Speaker Instruction Manual

Model: F50 | Brand: Kinglucky

1. Introduction

The Kinglucky F50 Under Pillow Sleep Speaker is designed to provide a personalized audio experience for sleeping and relaxation. Its ultra-thin design allows for comfortable placement under a pillow, delivering sound directly to the user without disturbing others. It features Bluetooth 6.0 connectivity, built-in sleep sounds, an auto-off timer, and support for TF/microSD card playback.

Kinglucky F50 speaker placed under a pillow with a person sleeping, illustrating private bedtime listening.

Image 1.1: Kinglucky F50 speaker positioned for private bedtime listening.

2. Product Features

  • Ultra-Thin Design: At just 11mm thick, it fits comfortably under your pillow without causing discomfort.
  • Bluetooth 6.0: Ensures stable and quick wireless connection to your devices for streaming audio.
  • Built-in Sleep Sounds: Includes pre-loaded calming sounds such as White Noise, Rain, and Ocean Waves.
  • TF/microSD Card Playback: Supports offline audio playback directly from a memory card (card not included).
  • Auto-Off Timer: Customizable timer settings for 30, 60, or 90 minutes to automatically turn off the speaker.
  • Long Battery Life: Up to 10 hours of playback on a single charge (at 60% volume).
  • USB-C Charging: Convenient and fast charging via a modern USB-C port.
Kinglucky F50 speaker showing its ultra-thin 11mm profile next to a coin.

Image 2.1: The Kinglucky F50's ultra-thin 11mm profile for discreet use.

3. What's in the Box

  • Kinglucky F50 Under Pillow Sleep Speaker
  • USB-C Charging Cable
  • Quick Start Guide

4. Setup

4.1 Initial Charge

Before first use, fully charge the speaker using the provided USB-C cable. Connect the USB-C end to the speaker's charging port and the USB-A end to a compatible power adapter (not included) or computer USB port. The charging indicator light will show charging status.

4.2 Placement

Place the Kinglucky F50 speaker under your pillow, ideally near the edge closest to your ear. This ensures optimal sound clarity and minimizes disturbance to others. The speaker's slim profile is designed to be unnoticeable during sleep.

Kinglucky F50 speaker placed under a pillow for side sleepers.

Image 4.1: Recommended placement of the speaker under a pillow for side sleepers.

5. Operating Instructions

5.1 Power On/Off

  • To Power On: Press and hold the power button (usually marked with a power symbol) for 2-3 seconds until the indicator light illuminates.
  • To Power Off: Press and hold the power button for 2-3 seconds until the indicator light turns off.

5.2 Bluetooth Pairing

  1. Ensure the speaker is powered on and in Bluetooth pairing mode (indicator light will flash blue).
  2. On your device (smartphone, tablet), go to Bluetooth settings and enable Bluetooth.
  3. Select "F50" from the list of available devices.
  4. Once connected, the indicator light will turn solid blue.

Video 5.1: Official Kinglucky video demonstrating the F50 Under Pillow Speaker's features and usage, including Bluetooth pairing.

5.3 Sleep Mode (Built-in Sounds)

  • Press the 'Sleep Mode' button (often marked with a moon or star icon) to cycle through the built-in white noise, rain, and ocean wave sounds.
  • The speaker will automatically play the selected sleep sound.

5.4 TF/microSD Playback

  • Insert a TF/microSD card (pre-loaded with audio files) into the designated slot on the speaker.
  • The speaker will automatically begin playing audio from the card.
  • Use the skip buttons to navigate between tracks.

5.5 Auto-Off Timer

  • Press and hold the timer button (often marked with '30/60/90') for 2 seconds to activate the timer.
  • Each short press will cycle through 30, 60, and 90-minute options. The corresponding indicator light will confirm the selection.
  • The speaker will automatically power off after the selected duration.
Kinglucky F50 speaker showing the auto-off timer function with 30, 60, 90 minute options.

Image 5.1: Setting the auto-off sleep timer on the Kinglucky F50 speaker.

5.6 Volume Control

  • Use the volume up (+) and volume down (-) buttons on the speaker to adjust the audio level.
  • Alternatively, adjust the volume directly from your connected Bluetooth device.

6. Maintenance

  • Keep the speaker dry and away from moisture.
  • Clean the speaker with a soft, dry cloth. Do not use harsh chemicals or abrasive materials.
  • Avoid dropping or subjecting the speaker to strong impacts.
  • Store in a cool, dry place when not in use for extended periods.

7. Troubleshooting

Problem Solution
Speaker does not power on. Ensure the battery is charged. Connect to a power source using the USB-C cable.
Cannot pair via Bluetooth. Make sure the speaker is in pairing mode (flashing blue light). Turn off and on Bluetooth on your device. Ensure no other devices are connected to the speaker.
No sound or low volume. Check the volume levels on both the speaker and your connected device. Ensure the speaker is properly placed under the pillow.
Auto-off timer not working. Ensure the timer is correctly set by pressing and holding the timer button for 2 seconds and then selecting the desired duration.
TF/microSD card not playing. Ensure the card is inserted correctly and contains compatible audio files (e.g., MP3). Try reinserting the card.

8. Specifications

Feature Detail
Model Name F50
Model Number X50
Brand Kinglucky
Connectivity Technology Bluetooth 6.0
Speaker Maximum Output Power 3 Watts
Battery Capacity 300 mAh
Battery Average Life Up to 10 Hours (at 60% volume)
Item Dimensions (D x W x H) 4"D x 4"W x 0.65"H
Control Method App, Touch
Specific Uses For Product Sleeping, Late-night listening, Bedtime routines

9. Warranty and Support

The Kinglucky F50 Under Pillow Sleep Speaker comes with a 2-year warranty. For any product inquiries, technical support, or warranty claims, please contact Kinglucky Official Store customer service through the platform where you purchased the product. Refer to your Quick Start Guide for additional contact information.

Common issues and solutions are also available in the Troubleshooting section of this manual.

© 2026 Kinglucky. All rights reserved.

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