I've only reviewed approx. twelve (12) LED wristwatches prior to this, so please bear with me here.
You might remember LED wristwatches from the 1970s, heck, you might still have one.
The Skmei Green LED Digital Watch (hereinafter, probably called simply an, "LED watch" or an, "LED wristwatch") is an LED watch that features a large display comprised of seven-segment LED "readouts", which are composed of nitride-based green LEDs -- something that appears fairly unusual in an LED wristwatch.
It can display the time & date like other digital watches, it also displays seconds if you require that feature, and it has a stainless steel case & band.
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The LED wristwatch comes ready to use right out of the bag. You may need to set the time & date - but is otherwise ready to go right away.
To read the time, press & release the button on the right side of the watch's body. A brief animation will be displayed, the time will be displayed for five5½ seconds, a brief animation again displays, and then the LEDs will automatically extinguish.
To read the date, press & release the button on the right side of the watch's body twice in fairly quick succession. A brief animation will be displayed, the date will be displayed for 5½ seconds, a brief animation again displays, and then the LEDs will automatically extinguish.
To read the seconds, press & release the button on the right side of the watch's body three times in fairly quick succession. The seconds will be displayed for 5½ seconds, a brief animation again displays, and then the LEDs will automatically extinguish.
The display will remain on (from beginning to end) for 7.05 seconds (timed with a stopwatch)
I do not posses or have access to a screwdriver small enough to do this job, so unfortunately I cannot tell you how to do it either.
Because this is a watch and not a flashlight, I won't try to flush it down the poddy, stomp on it with old or used bowling shoes, viciously throw it into one of those wall-mounted porcelain uranators to see if it becomes broken (the uranator, not the wristwatch), smack it against a steel rod, run over it with my Quickie motorised wheelchair, or perform other potentially destructive tests on it that might be performed on a flashlight.
As a wristwatch, I think it's quite nice. And to see real live LEDs in it, that's even better. I love LEDs and things made with them, and this watch is no exception.
This wristwatch uses PWM (Pulse Width Modulation) of its LED display to help prolong the life of its battery.
That is to say, the segments of its display are rapidly turned on and off; the speed at which this occurs is high enough though that the display appears to be lit continuously to the human eye.
The display isn't SUPER bright; if you work outdoors and prefer LED wristwatches to analogue or LCD watches, you may wish to use a different LED watch.
Unfortunately, the band size is WAAAAAAAYYYYY too large to fit my wrist, and there is no mention of how to adjust the band size in the furnished instructional materials, so I'm kind of SOL here unless I get a valid answer to my query to the seller about this.
Watch in its natural habitat -- on my wrist of course.
Photograph showing that the watch is significantly too large to fit my wrist; I do not know how to adjust the band size and the furnished instructional materials don't detail this procedure either.
Spectrographic analysis of the LEDs in this wristwatch.
Spectrographic analysis of the LEDs in this wristwatch; spectrometer's response narrowed to a band between 515nm and 535nm to pinpoint emission peak wavelength, which is 523.050nm.
The raw spectrometer data (tab-delimited that can be loaded into Excel) is at skmei-g.txt
Brief video on YouTube showing the watch displaying the time; note the brief animation that it displays immediately before and after the time is displayed.
TEST NOTES:
Product was purchased on Ebay on 09-03-21 and was received at 11:33am PDT on 09-13-21.
UPDATE: 00-00-00
PROS:
Fairly unique GREEN LED display
Very handsome to look at whether on or off
NEUTRAL:
CONS:
Band cannot be easily resized (this is BY FAR what nocked the most stars off its rating!!!)
Screws for back plate removal are so itty-bitty; you probably won't have a small enough screwdriver!
MANUFACTURER: Skmei
PRODUCT TYPE: Digital wristwatch with green LED display
LAMP TYPE: Green LED
No. OF LAMPS: 31
BEAM TYPE: N/A
REFLECTOR TYPE: N/A
SWITCH TYPE: Single momentary pushbutton for display/setting
CASE MATERIAL: Metal
BEZEL: Glass "crystal" protects LED display
BATTERY: Unknown type & number of lithium coin cells
CURRENT CONSUMPTION: Unknown/unable to measure
WATER- AND DOG PISS-RESISTANT: Yes
SUBMERSIBLE: Yes, to 30M (98.4 feet)
ACCESSORIES: Battery(ies)
SIZE: Unable to measure (
my new caliper is already "bucking fusted"); published as: 36mm (case width) x 10mm (case depth) x 22mm (band width)
WEIGHT: 110.20g (3.89 oz.)
COUNTRY OF MANUFACTURE: China
WARRANTY: Unknown/not stated
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I love LEDs and things made with them, and this watch is no exception.
