Sennheiser True Wireless White (508901), based on the CX 400BT platform, is a fully wireless in-ear earbud designed for everyday use. It uses Bluetooth for stable and high-quality wireless audio transmission. Active Noise Cancelling helps reduce background noise for a more focused listening experience. The built-in microphone ensures clear voice quality during calls. Touch controls allow easy management of music and calls. Its compact ergonomic design makes it suitable for long listening sessions.