Shokz OpenFit Earbuds Black OS. OpenFit is built around the ear leaving the inner ear open to keep you engaged with the world. Specifications for Shokz OpenFit Earbuds: Manufacturer: Shokz Weight: 73.85 g Battery Type: Lithium-ion Battery Headphone Style: In Ear Features of Shokz OpenFit Earbuds Ultra-Soft Silicone Dolphin Arc Ear Hook Light and Balanced Design Powerful Bass Experience Low-Frequency Enhancement Algorithm 18x11mm Customized Dynamic Drivers Made for s Secure Fit Clear and Smooth Call Quality Up to 28 Hours of Listening Easy Control Right on the Bud IP54 Water Resistance Package Contents: Shokz OpenFit Earbuds Cord Case Shokz T910-ST-BK-US: OpenFit Earbuds Black OS