ICOM M36 HANDHELD VHF MARINE TRANSCEIVER. Clear voice + voice boost: The M36 automatically adjusts the outgoing voice and the incoming audio to compensate for the ambient noise level: whether you're in a loud environment or in a quiet area, the M36 ensures your radio conversation is sent and received as clearly as possible. And yes, it floats: Continuing the legacy of the IC-M34, the M36 floats back up to the surface if dropped overboard, even if the optional speaker microphone, HM-165, is attached.LOUD button: 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. Noise cancelling microphone: The sub-microphone on the rear panel inverts phase and cancels out ambient noise from the main microphone. As a result, the M36 reduces the affect of background noise (particularly trebly noise) from the transmitted signal and makes it easier to catch voice communication. Automatic volume adjustment: When in an engine room or high noise environment, the sub-microphone detects the ambient noise and the M36 automatically increases the volume output to suit the surrounding environment. Low power consumption: Although the 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. Large buttons and slim dimensions: Thanks to the large, easy-to-operate buttons, the 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.