About this item New Pop-up Headphones: This earphone features Bluetooth connectivity. Simply turn on Bluetooth on your phone or tablet, then plug in the earphone to connect. The next time you use the earphone, it will automatically connect to your device in 2-8 seconds. This is the first step that must be done. Remote Control and Microphone: The included remote control allows you to adjust volume, control playback, and answer or end calls with a simple cord pinch. The built-in microphone ensures clear communication and enhances audio quality. Perfect Stereo Sound: Ergonomic and ultra-lightweight in-ear design with solid sound-insulating material reduces external noise while minimizing sound leakage, providing you with clear sound. Size: 3.94 x 2.72 x 0.71 inches.