When you use the BlackBerry® Wireless Headset HS-500 for the first time, you can use the volume controls on your BlackBerry device to set the volume to a comfortable listening level. When the noise level of your environment changes, the headset is designed to increase or decrease the volume to a comfortable listening level automatically so that you do not have to adjust the volume manually. If you want to readjust the volume manually, you can use the volume controls on your BlackBerry device.