The Lenovo Headphones provide great sound quality and fit every ear. With 3 unique designs, you can find a fit for any ear. The headphones provide excellent sound from your Think system's 3.5 mm audio jack. The inline controls work the majority of smart phones in the market, so you can stay in touch and on the go between the office and your home.3.5mm audio works with ThinkPads, tablets, work stations and smart phones. Lightweight design allows user to carry with them Unique ear designs: On Ear fits like a classic earbud headphone In Ear fits comfortably inside the ear canal, with 3 silicon tips Over-The-Ear combines the best of the in ear headphone with an over the ear loop to keep the headphones securely in place. Inline microphone is small and light, perfectly placed to make crystal clear calls Inline answer and hang up control works with the majority of smart phones.