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There are two elecrode pieces that need to be wet (spit or sweat work) to conduct the current for the heart rate monitor.
The MOTOACTV has a 1.6 inch display and fits wel in my hand. Also notice how great the display looks on the device.
Maps are included on the MOTOACTV and while they may be a bit difficult to view, they are helpful for planning and changing up your workouts.