Earbud headphones with in-ear fit and wired design (not wireless) Built-in microphone with controller (answer or hang up calls; pause or skip tracks) 20-20KHz frequency range; 94±3dB; 5mW max input Includes 2 spare silicon caps Durable gold-plated 3.5mm jack Compatible with any device with a 3.5mm jack, including Android and IOS smartphones; devices without a 3.5mm jack, like the iPhone 7, 8, 10, and Pixel 2, require an adapter Upgraded internal circuit addresses durability issues in previous version Product Dimensions: 51.18 x 0.79 x 0.51 inches (LxWxH) with a 4.2-foot cable Note: If the size of the earbud tips does not match the size of your ear canals or the headset is not worn properly in your ears, you may not obtain the correct sound qualities or call performance. Change the earbud tips to ones that fit more snugly in your ear.