The IC-M1V has concentric on/off and squelch knobs on its top. Though I need both hands to operate these, I prefer their infinitely variable control compared to the set increments buttons give you. The IC-M1V feels good in my hands (I have short fingers), and I can operate the keys equally easily with each hand. When the device is in my left hand, I can reach all the keys with my thumb. Holding the VHF in my right hand, I operate the keys on the face with my thumb and the push-to-talk key with my forefinger. The battery case on the back of the radio has indentations similar to those on a car's steering wheel. A small detail, but I was surprised by the extra security the indentations offer. Not that dropping this handheld matters; it survived my drop test-from about 5' above the cockpit sole-so I imagine a few bounces won't kill it. It's waterproof, too, but it doesn't float.