Serious Communication for serious boaters and commercial users! Some of the features of the Quantam include: Oversized alphanumeric LCD, Knobs and Keys, Large 2.8 inch internal speaker producing HUGE AUDIO, 30 Watt Loudhailer with listen back and 4 fog horns, Bells and Whistles, Removeable ClearVoice Speaker Microphone with 16/9 Key and Channel Selection, Optional VH-310 Telephone Style Handset allows two-way private communication, Display shows channel names and repeats GPS information (with GPS attached), Capable of connecting 2 optional enhanced microphones, DSC distress call automatically broadcasts lat/lon and vessel ID (with GPS attached). DSC position information request function and NMEA data input/output to connect to GPS plotter, Audio Tone Controller, 80dB Rejection, Versatile user-programmable Scanning, Priority Scan and Dual Watch, NOAA Weather Channels and Alert, One-button access to Channel 16 and 9, One-button access to selectable preset channels, Access to all USA, Canadian and International Channels. Many more outstanding features. 3-Year Waterproof Warranty.