1. Product Overview
The SHUKE MD538 Invisible Sleep Wireless Earphones are designed for comfort and high-quality audio, featuring a compact, ergonomic design suitable for various activities, including sleep and sports. They offer Bluetooth 5.3 connectivity, Hi-Fi stereo sound, and active noise cancellation.
Figure 1.1: Earbud worn in ear, highlighting its invisible design.
Figure 1.2: Ultra-thin Bluetooth earphones in white and black, with charging cases.
2. Setup
2.1 Package Contents
Please check the box for the following items:
- Charging box x 1
- Left and right headphones x 1 pair
- Data cable x 1
- User Manual x 1
2.2 Charging the Earphones
Before first use, fully charge the earphones and the charging case. The charging case features a smart LED power display to show the battery level of both earbuds and the case.
- Charging Interface: Type-C
- Headphone Charging Time: Approximately 1 hour
- Charging Duration (with charging compartment): Up to 24 hours
- Standby Time: Up to 480 hours
- Charging Voltage: DC 5V
Figure 2.1: Charging case with endurance details.
Figure 2.2: Smart display showing battery levels of earbuds and charging case.
2.3 Binaural Pairing Connection
- Pick up both headphones from the charging case. They will automatically start mutual configuration. Once successful, the white and green lights of the main headphone will flash alternately, and the LED lights of the auxiliary headphone will go out. (If mutual configuration doesn't occur, double-click either headphone to configure them.)
- Open the Bluetooth device list on your phone/tablet/computer and search for "MD538".
- Click to connect. The LED light on the headphones will go out once connected.
If the connection fails, place the headphones back into the charging box, close the lid, and repeat the steps above.
After the first connection, the headphones will automatically reconnect to the last paired device upon restart (if the mobile phone's Bluetooth is on).
2.4 Switching Between English and Chinese
When the headphones are powered on but not connected to any device, quickly press the function button 5 times to switch between English and Chinese voice prompts.
3. Operating Instructions
3.1 Power On/Off
- Power On:
- Pick up the headset from the charging case for immediate automatic boot-up. A green light will show for 1 second.
- When the headset is off, press and hold the function key for 1 second. A voice prompt "Power on" will be heard, and a green light will show for 1 second.
- Power Off:
- Place the headphones back into the charging box and close the lid. The headphones will automatically turn off, and a white light will show for 1 second.
- When the headset is on, long press the function key for 3 seconds. A voice prompt "Off" will be heard, and a white light will show for 1 second.
3.2 Controls
The earphones feature intelligent button controls for various functions:
Figure 3.1: Control functions via touch gestures.
| Function | Gesture |
|---|---|
| Play/Pause Music | Click L/R headset once |
| Volume Up | Right ear (R) click twice |
| Volume Down | Left ear (L) click twice |
| Next Song | Right ear (R) click three times |
| Previous Song | Left ear (L) click three times |
| Answer/End Call | Click L/R headset once |
| Reject Incoming Call | Long press any headset for 1.5 seconds |
| Wake Up Voice Assistant | Long press any headset for 1.5 seconds |
4. Maintenance
4.1 Waterproofing
The earphones are rated IPX6 waterproof (as per product title) and IPX5 sweatproof (as per image description), making them suitable for sports and protection against sweat and light rain. Avoid submerging the earphones in water.
Figure 4.1: Earbud being worn during exercise, demonstrating its waterproof and sweatproof capabilities.
4.2 Cleaning
To maintain optimal performance and hygiene, regularly clean your earphones and charging case. Use a soft, dry, lint-free cloth. Do not use abrasive cleaners or solvents. Ensure the charging contacts are free of dust and debris.
5. Troubleshooting
5.1 Common Issues
- Earphones not connecting to device: Delete the existing connection record on your device and attempt to reconnect.
- One earbud has no sound: Place both earbuds back into the charging case, then open the case and try reconnecting to your mobile phone. If the issue persists, reset the earphones to factory settings.
- Unstable connection or intermittent cut-outs:
- Ensure there are no physical obstructions between the earphones and your Bluetooth device.
- Check for and eliminate any nearby radio or Wi-Fi interference.
- Reset your earbuds to factory settings.
5.2 Resetting to Factory Settings
When the headset is powered off, press and hold the function key for 8 seconds. A voice prompt "Shuts down" will be heard, and a white light will show for 1 second, indicating that the factory settings have been restored.
6. Specifications
6.1 Product Parameters
Figure 6.1: Visual representation of product parameters.
| Feature | Specification |
|---|---|
| Model | MD538 |
| Material | ABS |
| Bluetooth Version | 5.3 |
| Wireless Type | Bluetooth |
| Communication | Wireless |
| Maximum Wireless Range | 10m-20m |
| Transmission Distance | ≥ 10m (barrier free) |
| Style | In-ear |
| Wearing Method | Semi in-ear wear |
| Vocalism Principle | Balanced Armature |
| Driver Diameter | 13mm |
| Number Of Drivers | 2 |
| Magnet Type | Neodymium |
| Frequency Response Range | 20 - 20000Hz |
| Sensitivity | 95dB |
| Resistance | 32Ω |
| Impedance Range | up to 32 Ω |
| Max Output | 2mW |
| Total Harmonic Distortion | 1% |
| Active Noise-Cancellation | Yes |
| Sound Isolating | Yes |
| With Microphone | Yes |
| Voice Assistant Built-in | Yes |
| Volume Control | Yes |
| Control Button | Yes |
| Waterproof Rating | IPX6 (Product Title), IPX5 (Image) |
| Battery Capacity | 300mAh |
| Battery Life (Play Time) | About 24 hours |
| Battery Life (Talk Time) | About 48 hours |
| Standby Time | About 480 hours |
| Charging Method | Charging case |
| Connectors | Type C |
| Line Length | 0.25m |
| Width | 95mm |
| Depth | 105mm |
| Height | 30mm |
| Weight | 80g (single headset approx. 3.2g) |
| Codecs | AAC, sbc |
| Support APP | Yes |
| Support Memory Card | No |
| Origin | Mainland China |
Video 6.1: Product demonstration showcasing features like ergonomic design, sleep wearability, outdoor use, button control, sound quality, and daily application.
7. User Tips
- Comfort for Sleep: The ultra-thin and ergonomic design (10.6mm thickness) ensures comfort even when lying on your side, making them ideal for sleep.
- Active Lifestyle: With IPX6 waterproof rating and a secure fit, these earbuds are perfect for sports and outdoor activities without fear of them falling out or being damaged by sweat.
- Clear Communication: The dual microphones and CNC noise reduction technology provide clear HD calls, making them suitable for office use or video games.
- Seamless Connectivity: Bluetooth 5.3 ensures a stable and low-latency connection, compatible with a wide range of devices including Android, iOS, and Windows.
- Easy Control: Utilize the intelligent button controls for quick access to music playback, call management, and voice assistant activation.
8. Regulatory Information
8.1 Certifications
This product complies with the following certifications:
- CE
- FCC
- RoHS
8.2 IC Caution (Canada)
This device contains license-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canada's license-exempt RSS(s). Operation is subject to the following two conditions:
- This device may not cause interference.
- This device must accept any interference, including interference that may cause undesired operation of the device.
Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
8.3 Additional Documentation
For a detailed user manual in PDF format, please refer to the official document: User Manual (PDF).
