Sennheiser HDE 2020-D-II US. It combines receiver and headphones; cable clutter as with receivers with separate headphones is a thing of the past. Your listeners do not carry more with them than is really necessary. The handset’s powerful battery provides up to 8 hours of operation, making it suitable for a whole day’s tour of a cultural city or a large company. The chinrest receiver switches on and off automatically when you put it on and take it off.

Product details : https://www.sennheiser.com/de-at/catalog/products/besucherfuhrung/hde-2020-d-ii/hde-2020-d-ii-us-504797