Touch to turn the speakerphone on or off. The light bar on the Speaker button illuminates blue to indicate that the speakerphone is on.
To avoid damage to your hearing, do not hold the phone against your ear when the speakerphone is turned on.
Touch to mute the microphone during a call. The light bar on the Mute button illuminates blue to indicate that the microphone is muted.
Touch to switch between a Bluetooth device and the phone. The light bar on the Bluetooth button illuminates blue to indicate that the call is using a Bluetooth device. This button is greyed out when there is no Bluetooth device available.