Step 1: To increase the volume, press the upper button on the left side of the iPhone*
Step 2: To decrease the volume, press the lower button on the left side of the iPhone*
* ReSound ONE hands-free calls are compatible with iPhone 11 or later, iPad Pro 12.9-inch (5th generation), iPad Pro 11-inch (3rd generation), iPad Air (4th generation), and iPad mini (6th generation), with software updates iOS 15.3 and iPadOS 15.3 or later.
