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If you do go for a cordless mouse, I would suggest
getting a cordless keyboard and mouse together. Each of
them individually will go for anywhere from 30-50$, while
a set is around 70$.
If you can, get a cordless mouse that is rechargeable
instead of one that runs on batteries. We have a battery
operated one and it eats batteries like crazy!
And why you should buy rechargeable batteries and a charger. Get 2 sets
of rechargeable batteries: when the set in the mouse gets low or dead
then swap them for the already charged ones, and then charge the
depleted set. The smaller the batteries the less charge they contain
and the faster they will deplete.
Regardless of the claims by cordless mouse makers that batteries should
last for more than month and maybe up to 40 days, it ain't true. They
must measure that based on only a couple hours use per day. I use my
mouse all day and all evening (okay, it's not constant but my computer
use spans most of the day along with the mouse use). Alkaline batteries
last me about 17 to 22 days while rechargeable NiMH batteries last 14 to
17 days.
Unless you need a cordless keyboard, don't bother. You might realize
the cordless mouse's batteries are going dead because the cursor moves
erratically or not at all, but often users start losing keystrokes or
pound harder on the keys when the cordless keyboard's batteries get low
or die. Not all cordless products provide a popup warning to replace
the batteries, and they be unseen if under an always-on-top window.
A cordless mouse will weigh more than a corded mouse. That's because of
the weight from the batteries. If you use your computer for hours upon
hours with lots of mouse use, your pinky will get fatigued having to
squeeze the mouse when repeatedly having to lift and move it over (and
why sometimes trackballs are preferred). But with a cordless mouse you
don't have the resistance of the moving its cord around with the mouse
or having it slap into stuff and create torque from resistance to
bending.