The Enhanced Noise Reduction feature available on select 2014 models lets you suppress background noise around the caller while simultaneously enhancing their voice making it easier to hear them. So a parent getting a call from their teenager at a concert can hear what time to pick them up or when a friend calls from a noisy ballgame, you can hear where to meet afterwards. Attach the optional Key Detector to your car key ring or other easily misplaced items and forget about ever losing them ever again. Using any of your telephone handsets, you can activate the Key Detector's beeping alarm and quickly track down your lost keys. Key Detector's powerful range finds objects up to 200 yards away so you'll find whatever's lost whether it's upstairs, in your car or in the yard. You can register up to four Key Detectors and give each a distinctive name, like Dave's keys, Sharon's keys, etc. Any Key Answer Call Block Cellphone Synchronization Chain Dial Channel Eco Mode Handset Locator Hold Noise Reduction System Silent Mode Speed Dial Talking Caller ID Voice Mail Volume Control Alarm Bilingual Menu Call Share Call Waiting Clock Conference Call Flash Intercom Key Detector Compatible Mute Phone Book Ringer ID Text-to-Speech Voice-mail Indicator Maximum cordless handset supported: Six (6) Black Model: KX-TGE212B Included items: KX-TGE212B Duo Cordless PhoneBelt clip Dimensions: 7 inches x 7 inches x 7 inches Weight: 2 pounds