Equipped with a long list of features,the Ray54 packs professional grade VHF communications into a compact design that is both attractive and affordable. Standard Class D (Digital Selective Calling) capability enables you to transmit vital emergency information including your boats identification,position and time of distress using NMEA 0183 data from your GPS. A large multi line LCD and intuitive rotary controls simplify DSC operation. Rugged Submersible Construction Channel change, 16/9 and HI/LO power controls built into microphone Rotary channel, volume and squelch controls Extra Large Multi Line LCD Programmable scan Tri-watch DSC digital mayday distress key DSC Phone directory Three Year Warranty Specifications Backlighting Display and Keypad Channels Includes all US and international channels Dimensions (H x W x D) 2.9”(73 mm) x 6.5”(166 mm) x 6.47”(164.5 mm) 5.83”(148 mm) x 2.4” (61 mm) hole required for flush mounting Frequency range TX: 156.025 ? 157.425 MHz. RX: 156.050 ? 163.275 MHz Modulation Frequency Modulated Power 25 or 1 Watt settings Priority Channels 16/9 Key:Instant channel 16 or your preset priority channel Watch Tri-watch:Scans working channel,channel 16 and preset secondary priority channel Dual Watch:Scans working channel and priority channel 16 Waterproof IPX7 submersible;1 meter for at least for 30 minutes