Sennheiser True Wireless Black 200 Series (508973) is a fully wireless in-ear headphone designed for everyday use. Passive Noise Cancellation provides natural sound isolation by sealing the ear canal. The TrueResponse transducer delivers clear, balanced, and detailed audio performance. Customizable touch controls allow easy management of music and calls. With an IPX4 rating, it is resistant to splashes and sweat. It offers up to 27 hours of total battery life with the charging case for extended listening sessions.