Sennheiser M4 True Wireless Silver (700366) is an in-ear True Wireless earbud designed for everyday use and travel. It features Bluetooth 5.4 for stable and fast connectivity. Active Noise Cancellation (ANC) and Transparency mode allow control over surrounding sounds. The built-in microphone ensures clear and high-quality calls. Battery life offers up to 7.5 hours on the earbuds and up to 30 hours with the charging case.