The Standard Horizon HX400IS submersible intrinsically safe handheld VHF is built to withstand day-in-day-out punishment in hostile commercial environments. Its features include a speaker microphone jack 40 programmable Land Mobile Radio channels with CTCSS and DCS signaling and a unique super bright LED distress strobe light. Combining multiple features for a wide variety of users. Intrinsically Safe The submersible HX400IS intrinsically safe handheld VHF is built to withstand day-in-day-out punishment in hostile commercial environments. The HX400IS SBR-29LIIS Intrinsically Safe battery pack and optional SSM-14A and CMP460 speaker microphones all meet ANSI/UL 913-5th Ed. Requirements for Class I Flammable Gases VaporsLiquids Div. 1 Group C (Ethylene) Group D (Propane) Class II Combustible Dust Div. 1 Group E (Metals) Group F (Coal) Group G (Grain) Class III Ignitable Fibers and Flyings Temperature Code T3. Lithium-ion battery and charger The HX400IS is supplied with a whopping 2550 mAh Lithium-Ion battery that will keep you talking for about 17 hours. There is no need to worry about the time it takes to fully charge the huge 2550 mA battery as the HX400IS is supplied with a 3-hour rapid charger. Marine and Land Mobile Channels The HX400IS is factory programmed with all USA Canadian and International and NOAA Weather channels. It also can be programmed with 40 Land Mobile Radio (137-174MHz) channels with CTCSS or DCS signaling by a Standard Horizon dealer. Built-in Noise-Canceling Mic and Voice Scrambler The HX400IS will surpass your voice transmission expectations in noisy and windy environments with the built-in noise-canceling microphone. No need to purchase an optional voice scrambler for secure communications as the HX400IS has it built-in. The internal scrambler is compatible with Standard Horizon VHF Fixed.