In the video, a person is holding a smartphone in their hand and using their thumb to control the volume of the music playing on the phone. The phone is an HTC brand, and the person is using the volume control buttons on the side of the phone. The music is playing through the phone's speakers, and the person is adjusting the volume by pressing the volume buttons. The person's thumb is visible, and they are wearing a ring on their ring finger. The phone is held in landscape orientation, and the person's thumb is moving back and forth on the volume buttons.