NANK Runner4 Bone Conduction Swimming Headphones

NANK Runner4 are open-ear bone conduction headphones built for swimming, running and cycling — they combine IP68 waterproofing, 16GB onboard MP3, and Bluetooth 5.4 in a lightweight titanium frame.

These headphones deliver audio through bone conduction so your ear canals stay open to ambient sound while you listen. With a skin-friendly silicone back bridge and a durable titanium frame, the Runner4 is designed to stay comfortable during long workouts and resist sweat, rain and even full submersion. Choose Bluetooth mode for everyday runs or MP3 mode for uninterrupted underwater listening.

How do Runner4 headphones stay safe and comfortable during exercise?

The Runner4 combines a flexible silicone back bridge and a lightweight titanium frame to provide a secure, all-day fit that resists slipping. The open-ear design preserves awareness of surrounding sounds, which is useful on busy roads and trails.

• skin-friendly silicone back bridge for pressure relief
• titanium frame for strength with low weight
• open-ear bone conduction keeps ear canals free
• IP68 protection against sweat, rain, and submersion

Can I use these headphones for swimming and underwater listening?

Yes — the Runner4 are rated IP68 and use nano-coating plus ultrasonic seals to block water. For reliable underwater playback, use the built-in 16GB MP3 mode because Bluetooth signals don’t travel well through water.

• IP68 waterproof rating for full submersion
• 16GB internal storage holds up to ~2000 songs
• MP3 mode eliminates reliance on Bluetooth when swimming
• waterproof construction prevents sweat and moisture damage

What audio and connectivity features improve sound and privacy?

Runner4 uses the NANK ResoVibe and OT leakage reduction tech to limit sound leakage and improve clarity during outdoor use. Bluetooth 5.4 offers a stable, low-latency wireless connection for compatible devices when not underwater.

• NANK 3rd ResoVibe sound shaping for clearer bone conduction audio
• OT leakage reduction 3.0 minimizes sound escaping to others
• Bluetooth 5.4 for stable wireless pairing and reduced latency
• automatic echo and wind-noise suppression while running

How long does the battery last and how quickly does it charge?

The Runner4 delivers up to 8 hours of continuous playback on a 1.6-hour full charge and supports a fast 10-minute quick charge to deliver about 2 hours of use. The battery supports extended sessions for multi-hour workouts and travel without frequent recharging.

• up to 8 hours playtime per full charge
• 1.6 hours for a complete recharge
• 10-minute quick charge yields roughly 2 hours playback
• language mode toggle for Chinese/English via button combo

Who is this for? The NANK Runner4 suits athletes and active users who need a water-ready, open-ear audio solution: swimmers who want onboard MP3 playback, runners and cyclists who want ambient awareness and minimal sound leakage, and anyone who prefers a lightweight titanium frame for extended wear. If you swim regularly, train outdoors, or dislike in-ear plugs, the Runner4 offers a practical mix of comfort, durability, and standalone music playback.