1. Product Overview
The OPPO Enco M31 are Bluetooth neckband earphones designed for high-quality audio and clear communication. They feature AI-powered noise reduction for calls, certified Hi-Res Wireless Audio, and an IPX5 water-resistant rating, making them suitable for various activities. These earphones are compatible with both Android and iOS devices.
Image 1.1: OPPO Enco M31 Bluetooth Neckband Earphones, front view.
2. What's in the Box
Carefully unpack the contents of your OPPO Enco M31 package. The following items should be included:
- OPPO Enco M31 Neckband Earphones
- Additional Eartips (3 pairs: S, M, L)
- Type-C Charging Cable
- Quick Guide Book
3. Setup Guide
3.1. Charging the Earphones
Before initial use, fully charge your OPPO Enco M31 earphones. Use the provided Type-C charging cable to connect the earphones to a compatible USB power source. The LED indicator on the neckband will show the charging status. A full charge provides up to 12 hours of use.
3.2. Bluetooth Pairing
- Ensure the earphones are powered off.
- Press and hold the multi-function button until the LED indicator flashes blue and red, indicating pairing mode.
- On your device (smartphone, tablet, etc.), enable Bluetooth and search for available devices.
- Select "OPPO Enco M31" from the list of found devices to connect.
- Once connected, the LED indicator will turn solid blue.
Dual Device Pairing: The Enco M31 supports connecting to two devices simultaneously. To switch between paired devices, press and hold the play/pause/multifunction button and the volume down button simultaneously for 1-3 seconds.
Image 3.1: OPPO Enco M31 Neckband Earphones, showing the neckband design and potential charging port location.
4. Operating Instructions
4.1. Basic Controls
The earphones feature integrated controls on the neckband for easy management of audio and calls.
- Power On/Off: Press and hold the multi-function button.
- Play/Pause: Single press the multi-function button.
- Volume Up/Down: Use the dedicated volume buttons.
- Next Track: Double press the volume up button.
- Previous Track: Double press the volume down button.
- Answer/End Call: Single press the multi-function button.
- Reject Call: Press and hold the multi-function button.
- Activate Voice Assistant: Triple press the multi-function button.
- Bass Mode: The multi-function button can also activate a bass boost mode. Refer to the quick guide for specific activation steps.
Image 4.1: Close-up view of the OPPO Enco M31 earbuds, highlighting their design.
4.2. AI-Powered Noise Reduction for Calls
The OPPO Enco M31 incorporates an industry-leading AI-powered noise reduction algorithm. This technology helps to keep your voice clear and distinct during phone calls, even in noisy environments, by intelligently filtering out background sounds.
4.3. Certified Hi-Res Wireless Audio (LDAC)
Experience enhanced audio fidelity with Certified Hi-Res Wireless Audio support. The earphones offer a frequency response range extended to 40KHz, especially when utilizing the LDAC codec (at 96KHz, 990Kbps), allowing for a broader spectrum of sound details.
4.4. IPX5 Water Resistance
The earphones are professionally designed and certified with an IPX5 water resistance rating. This means they are protected against low-pressure water jets from any direction, making them suitable for workouts and light rain. They are not designed for submersion in water.
Image 4.2: OPPO Enco M31 earphones demonstrating water resistance.
4.5. Device Compatibility
The OPPO Enco M31 earphones are designed for broad compatibility and can be perfectly adapted for use with both Android and Apple iOS smartphones and other Bluetooth-enabled devices.
Image 4.3: User wearing OPPO Enco M31 earphones during daily activity.
5. Maintenance
Proper maintenance ensures the longevity and optimal performance of your earphones.
- Cleaning: Regularly wipe the earphones and eartips with a soft, dry, lint-free cloth. For eartips, you may use a slightly damp cloth with mild soap, then dry thoroughly before reattaching. Do not use harsh chemicals or abrasive materials.
- Storage: When not in use, store the earphones in a clean, dry place away from extreme temperatures, direct sunlight, and dust. Avoid tangling the neckband and cables.
- Water Exposure: While IPX5 water-resistant, avoid prolonged exposure to water or high humidity. If they get wet, dry them thoroughly before charging or using.
- Eartip Replacement: If the eartips become worn or damaged, replace them with the provided additional pairs or genuine OPPO replacements to maintain sound quality and comfort.
6. Troubleshooting
If you encounter issues with your OPPO Enco M31 earphones, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Earphones do not power on. | Low battery. | Charge the earphones fully using the Type-C cable. |
| Cannot pair with device. | Earphones not in pairing mode; Bluetooth off on device; device too far. | Ensure earphones are in pairing mode (flashing blue/red LED). Turn on Bluetooth on your device. Move device closer to earphones. Forget previous pairings on your device and try again. |
| No sound or poor sound quality. | Volume too low; improper eartip fit; interference; low battery. | Adjust volume on earphones and device. Ensure eartips fit snugly. Move away from sources of interference. Charge earphones. |
| Microphone not working during calls on PC/Laptop. | Device audio settings; compatibility issues with specific applications. | Check your PC/laptop's sound settings to ensure the Enco M31 is selected as the input device. Some applications (e.g., Webex, Microsoft Teams) may have specific microphone settings. Consider using the earphones with a mobile device for calls if issues persist on PC. |
| Audio lag, especially with LDAC. | LDAC codec processing; device performance; environmental interference. | While LDAC offers high fidelity, it can sometimes introduce latency. Try disabling LDAC in your device's Bluetooth settings if available, or switch to a standard codec like AAC/SBC. Ensure your device has sufficient processing power. |
7. Technical Specifications
| Feature | Specification |
|---|---|
| Model Name | OPPO Enco M31 |
| Connectivity Technology | Wireless (Bluetooth) |
| Wireless Communication Technology | Bluetooth |
| Driver Sensitivity | 101.9dB @1kHz |
| Frequency Response Range | 20Hz-20KHz (44.1KHz), 20Hz-40KHz (LDAC 96KHz, 990Kbps) |
| Microphone Sensitivity | -38 dBV/Pa |
| Battery Life | Up to 12 Hours |
| Charging Port | Type-C |
| Water Resistance Level | IPX5 (Waterproof) |
| Item Weight | 22 Grams |
| Product Dimensions | 14.5 x 2.9 x 12.7 cm |
| Material | Plastic |
| Special Features | AI Noise Cancellation for Calls |
| Compatible Devices | Smartphone, PC |
| Manufacturer | OPPO |
8. Warranty and Support
8.1. Warranty Information
The OPPO Enco M31 Bluetooth Neckband Earphones come with a 1 Year Warranty from the date of purchase. This warranty covers manufacturing defects and issues arising from normal use. Please retain your proof of purchase for warranty claims. The warranty does not cover damage caused by misuse, accidents, unauthorized modifications, or normal wear and tear.
8.2. Customer Support
For technical assistance, warranty claims, or further inquiries, please contact OPPO customer support:
- Manufacturer: OPPO Mobiles India Pvt Ltd
- Address: 5th FLOOR, Tower B, BUILDING, N-8, DLF Cyber City, DLF Phase 2, Gurugram, Haryana 122002
- Toll-Free Number: 18001032777
