The Sony WI-C400 is a set of wireless in-ear headphones designed for on-the-go users. They feature a lightweight and comfortable design, making them suitable for extended wear. The neckband style ensures that the headphones stay securely in place while allowing for easy storage when not in use. The WI-C400 integrates Bluetooth technology for seamless connectivity to various devices, enabling users to enjoy their favorite music and take calls without the hassle of wires. The headphones are equipped with an in-line remote, providing easy access to playback controls and call management. With a battery life of up to 20 hours, these headphones are designed to last throughout the day on a single charge. The built-in microphone allows for clear communication during calls, while the 9mm dynamic drivers deliver powerful and balanced sound. Additionally, they support the Sony Visualizer app, allowing users to customize sound according to their preferences.