In marine environments there are many sources of noise that can affect the quality of your communications, such as engine noise, breaking surf and more. The IC-M36 automatically adjusts the outgoing voice and the incoming audio to compensate for the ambient noise level whether youre in a loud environment or in a quiet area, the IC-M36 ensures your radio conversation is sent and received as clearly as possible. Continuing the legacy of the IC-M34, the IC-M36 floats back up to the surface if dropped overboard, even if the optional speaker microphone, HM-165, is attached. When you need an instant boost in the volume, a simple push of the LOUD button gives you full volume immediately. In addition, holding the LOUD button mutes the audio output. The sub-microphone on the rear panel inverts phase and cancels out ambient noise from the main microphone. As a result, the IC-M36 reduces the affect of background noise (particularly trebly noise) from the transmitted signal and makes it easier to catch voice communication. When in an engine room or high noise environment, the sub-microphone detects the ambient noise and the IC-M36 automatically increases the volume output to suit the surrounding environment. Although the IC-M36 delivers a high 6W RF output and 700mW audio output, its current saving circuit offers a practical 8 hours of operating time with the supplied 980mAh Lithium-Ion battery pack. Thanks to the large, easy-to-operate buttons, the IC-M36 provides intuitive operation. A pinched-waist slender body makes it easy to hold and carry the radio, and is surprisingly compact for a floating radio. Waterproof construction equivalent to IPX7 (1m depth for 30 minutes). Dual/Tri-watch functions. 4-step battery life indicator. Weather channel with weather alert. Auto scan function. Instant access to Ch 16 or Ch 9.