Clear Voice Boost

In addition to manual adjustment, the radio itself adjusts speaker output level automatically according to the ambient sound pressure level so that you will not miss communications during a sudden burst of noise. The automatically set volume can be instantly over-ridden by manual operations including instant max volume / mute selection
Other features:

• ?True? noise canceling internal microphone
• Max. 6W RF output power
• Waterproof! Yes, IPX7 submersible!Even with the optional alkaline battery tray
• 2-step power save function Stretch the battery charge to its limits
• Very large backlit display & keypad Easy use in foul weather!
• Weather alert
• Dual and Tri watch
• Optional waterproof/ floating speakermic (HM-165)