Introduction
Thank you for choosing the Smof Open-Ear Headphones with Noise-Canceling Mic, Model LK02. These headphones are designed to provide clear audio for calls and music while keeping you aware of your surroundings. Featuring Bluetooth 5.1, aptX-LL technology, and a rotatable noise-canceling microphone, they are ideal for business, online meetings, driving, and general use.
What's in the Box
- 1 x Smof Open-Ear Headphones (Model LK02)
- 1 x Type-C Fast Charging Cable
- 1 x User Manual
- 1 x Storage Case

Image: The package contents, including the headphones, charging cable, user manual, and a protective storage case.
Product Overview & Features
The Smof LK02 headphones offer a unique open-ear design for situational awareness and comfort, combined with advanced audio technology.
- Open-Ear Air Conduction Design: Allows you to hear your surroundings while enjoying audio, enhancing safety and hygiene.
- Bluetooth 5.1 with aptX-LL: Ensures stable, fast, and low-latency audio transmission for perfect synchronization of audio and video.
- Noise-Canceling Boom Microphone: Features advanced ENC (Environmental Noise Cancellation) technology to pick up your voice clearly and block ambient noise. The microphone is 270° rotatable for optimal positioning and can be muted.
- Comfort & Durability: Lightweight (1.44oz/41g) with soft silicone ear pads and an ergonomic design. The aluminum alloy back-hanging structure is strong and flexible.
- Long Battery Life: Up to 8 hours of talk time or 10 hours of listening time on a single 2-hour charge, with 40 hours of standby time.
- Smart Touch Control: Multifunction buttons for easy control of playback, calls, volume, and voice assistant activation.

Image: Open-Ear Air Conduction Design for comfort and awareness.

Image: 270° Rotatable Noise-Canceling Boom Mic.

Image: Emergency Mute Function.

Image: 10 Hours Working Time.
Setup: Bluetooth Pairing
- Power On: Press and hold the power button on the headphones until the LED indicator flashes blue and red, indicating pairing mode.
- Activate Bluetooth: On your device (smartphone, laptop, etc.), go to Bluetooth settings and ensure Bluetooth is enabled.
- Select Device: Look for "LK02" in the list of available devices and select it to connect.
- Confirmation: Once connected, the LED indicator on the headphones will flash blue slowly, and you will hear an audible confirmation.
The headphones are widely compatible with mobile phones, PCs, laptops, tablets, and smartwatches.
Operating Instructions
General Controls

Image: Smart Touch Control functions.
- Power On: Press and hold the multifunction button for 3 seconds.
- Power Off: Press and hold the multifunction button for 3 seconds.
- Play/Pause: Single tap the multifunction button.
- Volume Up: Single tap the '+' button.
- Volume Down: Single tap the '-' button.
- Next Song: Press and hold the '+' button for 2 seconds.
- Previous Song: Press and hold the '-' button for 2 seconds.
- Activate Voice Assistant: Press and hold the '+' and '-' buttons simultaneously for 2 seconds.
Call Management
- Answer Call: Single tap the multifunction button.
- End Call: Single tap the multifunction button.
- Reject Call: Press and hold the multifunction button for 2 seconds.
- Call Switching: Press and hold the multifunction button for 2 seconds during a call to switch between calls.
- Mute Microphone: Flip the microphone boom upwards to mute, or downwards to unmute.
Video Demonstration: Air Conduction Headset with Mic
Video: A demonstration of the Air Conduction Headset with Mic, showcasing its features and usage.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the headphones. Do not use harsh chemicals or abrasive materials.
- Storage: Store the headphones in the provided storage case when not in use to protect them from dust and damage.
- Charging: Use the provided Type-C charging cable. Avoid overcharging the battery.
- Water Resistance: The LK02 headset is not water resistant. Avoid exposure to rain, sweat, or other liquids to prevent damage.

Image: Important note on water resistance during activities like riding.
Troubleshooting
- Cannot Pair: Ensure the headphones are in pairing mode (flashing blue/red LED). Turn off and on your device's Bluetooth. Move closer to your device.
- No Sound: Check the volume levels on both the headphones and your connected device. Ensure the headphones are properly connected via Bluetooth.
- Poor Call Quality: Ensure the microphone boom is positioned correctly near your mouth. Check for excessive background noise.
- Intermittent Connection: Move closer to your device and away from potential interference sources (e.g., Wi-Fi routers, other Bluetooth devices).
- Battery Not Charging: Ensure the charging cable is securely connected to both the headphones and a power source. Try a different charging cable or power adapter.
Specifications
| Model Name | LK02 |
| Connectivity Technology | Wireless (Bluetooth 5.1) |
| Audio Driver Type | Dynamic Driver |
| Noise Control Features | Environmental Noise Cancellation (ENC) |
| Battery Life | Up to 10 Hours (listening), 8 Hours (talk time) |
| Charging Time | 2 Hours |
| Standby Time | 40 Hours |
| Item Weight | 41g (1.44oz) / 200 Grams (package weight) |
| Material | Aluminum, Silicone |
| Water Resistance Level | Not Water Resistant |
| Compatible Devices | Cellphones, Laptops, Desktops, Tablets, Smartwatches |
Safety Information
- Do not expose the headphones to extreme temperatures or humidity.
- Avoid dropping or subjecting the headphones to strong impacts.
- Do not attempt to disassemble or repair the headphones yourself. Contact customer support for assistance.
- When using the headphones in traffic or other potentially hazardous environments, ensure the volume is at a level that allows you to hear important ambient sounds.

Image: Hear Your Music, Not Your Blindspot - emphasizing safety with open-ear design.
Warranty and Support
For warranty information, technical support, or any questions regarding your Smof LK02 Open-Ear Headphones, please refer to the contact details provided in the packaging or visit the official Smof website. Keep your purchase receipt for warranty claims.