Sennheiser MOMENTUM True Wireless 3 Noise-Canceling In-Ear Headphones (Graphite) - Manual (Page 14)

Getting started
14 | MOMENTUM True Wireless 3
Connect the earbuds to your smartphone via Bluetooth (> 20).
4. Installing the Smart Control app on your
smartphone
The Sennheiser Smart Control app allows you to use all functions
and settings of the earbuds and to e.g. adjust the sound to your liking
using the equalizer (> 23).
Smart Control
“Sennheiser Smart Control”