On the front surface of the H720 is an inset oval above the Motorola logo that acts as the multifunction button. It's big enough to find by feel and is also easy to press. Also on this button is a tiny LED indicator. The volume controls are on either side of the headset, and the charger jack is on top.
To turn the headset on and off, you can just flip the boom mic open and closed. This makes it much easier to power on/off the headset, and helps save battery as well. Flip the headset over and you will find an unusual-looking earpiece. It doesn't fit inside the ear like most headsets; it's actually just a flat plastic protrusion with three speaker holes cut out. You wear it so that it sits gently at the opening of the ear.