Make sure you de-register it before you dispose of it. Many can be opened by removing four stainless screws, at which point you can usually
lift out the
battery pack and drop it off at anyplace that recycles
batteries. The
electronics can often be recycled in the same or a different place.
Or you can mail it off to someone who is willing to try replacing the batteries and putting it to a second life, totally keeping it out of the landfills.