Logitech M190

Replacement, close or nearest to a decade's use from its no less
budgeted former model, which had lost the LED signal or no longer
produced a red illuminated strobe from the underside. The older model
had a strip of silicon wrapping around the edges and flat touch-sensor
area to duplicate the wheel. The M190 is largely identical except for
forgoing the touchsensor to a conventional wheel, along with raised
plastic ridges around the edge rather than the luxury of a supple
silicon feel of the former (which was beginning to wear through and
off). What the M190 does have is an non-visible laser running from
one AA instead of the two for its predecessor, which, to claim
18-month operation, may outlast the older model's 2xAA operation
duration. Daunting, though the "invisible" LED may not offer sensory
feedback of a red LED present, to see it operating, it would appear
equal if better adapted to any surface, operates indifferently, apart
from friction, whether from a mouse pad or a clear pane of glass.

Perhaps worth twice the price of a no-name Chinese $7/US import for
Logitech quality on some products, anyway, that tend to endure. (There
are similar model (variants on invisible wavelength and a single 1.5V
source battery) which might well be regarded opportunistic, presently
with retail prices twice over the M190.)

Leaving me with four variously RF receiver units. Paired uniquely to
factory models, there's however some leeway between model overlap and
frequency pairing. Tempting to try them on refurbished Logitech
units, discounted to nothing, a couple bucks, in lacking to include
the lost original paired RF USB adaptors.

Compared with the same technology for mandatory auto safety measures
of radio transmitting tire valve stems, technology strikes out again
in amazement -- the two-dollar refurbished mouse for comparatively a
$1000 auto repair for worn tire batteries, re-mating replacement valve
stems for a dashboard LED tire- light low pressure indicator, is
nothing less than profundity.

On Wed, 10 Feb 2021 21:33:06 -0500, Flasherly
wrote:

Perhaps worth twice the price of a no-name Chinese $7/US import

While awaiting the M190 to arrive I used a $3/US (no-inflated) Chinese
RF mouse brandname: Tested for U.S.A. Officeuse. Sitting unused for a
decade, a backup unit subsequent to work fine after I'd figured it
out: Not to blind myself by looking too curiously too long into the
laser, to identify the stuck-in bit of plastic was in fact the RF USB
port, and then importantly to push the most innocuous button when it
shortly powers down while idle.