Sennheiser MOMENTUM M2 IEBT Free In-Ear Wireless (507490) is an in-ear wireless headphone designed for everyday use. It features Bluetooth connectivity for convenient wireless listening. Its closed design provides a more focused sound experience. With a frequency response of 15 Hz to 22 kHz, it delivers detailed and balanced audio. It has a 28 Ohm impedance for stable performance. A built-in microphone allows hands-free calling. Battery life lasts up to 6 hours. Its lightweight (0.6 oz) and compact design makes it suitable for daily use.