Havit HV-139D 3.5mm Stereo Headphone Black (Double Port /Single Port)

1. Audio Connectivity: The headphones use a standard 3.5mm audio jack, making them compatible with a wide range of devices such as smartphones, tablets, laptops, MP3 players, and more.
2. Stereo Sound: They are designed to deliver stereo sound, which means you can expect audio output through both the left and right ear cups for a more immersive listening experience.
3. Comfort: The headphones usually come with padded ear cushions and an adjustable headband to provide comfort during extended listening sessions.
4. Design: The design can vary, but they are generally built for durability and style. The black color mentioned in your query suggests a sleek and neutral design.
5. Port Options: You mentioned "Double Port / Single Port." This could refer to variations of the product. A "double port" might imply that the headphones have two audio jacks for sharing audio with another person, while "single port" likely means a standard single audio jack for individual use. Please check the product listing or packaging for specific details on this feature.
6. Compatibility: These headphones should be compatible with most devices that have a 3.5mm audio output, but it's always a good idea to verify compatibility with your specific device.
7. Accessories: Depending on the package, the headphones may come with additional accessories like an adapter or a carrying case.