MOTOROLA (MOT98675) Deluxe Bluetooth Car Kit HF850 Blue Indicator LED - Provides a visual cue (around the multifunction button) about wireless speaker status. Attention grabbing light signifies on or synced modes. Mute Button - Allows you to mute or unmute calls. Voice Recognition Button - Allows you to easily place calls using your phone's voice dial feature. Volume Buttons - Allow you to increase and decrease volume levels. Backlighting - All buttons are backlit for easy viewing in dark conditions.