RED KEYCHAIN LASER
Red Keychain Laser, retail $4 (www.wish.com...*)
Manufactured by (Unknown)
Last updated 03-03-21
The Red Keychain Laser fits on your keychain and feeds from three LR44 button cells.
It fits on your keychain with the split-ring, so you can carry it anywhere.
Because this is a laser, you should not shine it into your eyes, other people's eyes, pet's eyes, etc. Just use a little common sense here, ok?
Wavelength was spectrographically measured at 654.10nm and power output was measured at 9mW.
SIZE
To use your new portable laser, dump the batteries out first, look for a white plastic disc (that should be between two of the cells) and discard it. Replace the batteries (see below) and then you'll be ready to go to town.
Press the gold-colored button on the barrel and hold it down for as long as you want or need the laser beam, and release it to shut the unit back off.
Don't aim the laser at your face when you push the button, otherwise you might hit yourself in the eyes with the laser beam, and that wouldn't be very good at all.
This portable laser requires three LR44 button cells, which are installed in the laser already (though you'll need to remove them in order to remove the insulating disc) so you don't need to run to the store right away. To change them, unscrew and remove the tailpiece, dash it to the floor, and stomp on it...O WAIT!!! YOU'LL NEED THAT!!! So just set it aside instead. 
Tip the open end of the portable laser into your hand, and dispose of or recycle the three button cells that come out as you see fit.
Stack three new LR44 button cells on top of one another on a table, countertop, or other flat surface, button-end (-) negative facing up. Lower the portable laser over this stack so all three cells are in the barrel. Slide the assembly to the edge of whatever surface you're reloading the pointer on, and place your finger over the portable laser's opening as you slide it over the edge, so all those batteries don't just clatter to the floor. Invert (flip over) the portable laser now, so the open end of the barrel faces up. Remove your finger. Screw the tailpiece back on, and be done with it.
Aren't you glad you didn't stomp on that tailpiece now?
Measures 53.40mA on my DMM's 200mA scale.
As "Hoo Phlung Pu" merchandise goes, this portable laser is built relatively sturdily. It is not water-resistant or submersible, and probably would not withstand being stomped on or run over either. But it should not break just hanging on your keychain.
Since portable lasers like this are not meant to be stomped on, run over, drowned in the commode, or otherwise abused, I will not inflict those sorts of punishments upon these. So this section of the web page will be a bit on the bare side. :-/
The portable laser emits a red beam at approximately 655nm in wavelength (spectrographically measured at 654.10nm), and has an apparent output power exceeding 5mW; probably really close to 10mW (measured at 9mW). Yet the labelling on the laser indicates it outputs less than 5mW. Just thought you ought to know, in case you buy one of these and then take it with you when you travel to an area of the planet where the public use of laser pointing devices is limited to lasers of CDRH Class II (less than 1mW) or lower.
The UK is one such country, that I know of anyway.
I don't know what the punishment for breaking this rule is, but it can't be very good for your portable laser, and maybe your pocketbook too. 
I don't believe you'll have to go to prison, but at very minimum I believe your portable laser will be confiscated and you may have to pay a fine.
The portable laser's dot on a wall approximately 12" away.
Does not appear white or as large in real life.
Power output measures 9mW on a LaserBee AX 3.0 Watt Laser Power Meter w/Thermopile.
The portable laser's dot on a wall approximately 10 feet away.
Again, it does not appear white or as large in real life
Spectrographic analysis of this laser.
Spectrographic analysis of this laser; spectrometer's response narrowed to a band between 6505nm and 660nm to pinpoint peak wavelength, which is 654.10nm.
The raw spectrometer data (tab-delimited that can be loaded into Excel) is at laserkey.txt
USB2000 Spectrometer graciously donated by P.L.
TEST NOTES:
Test unit was purchased at Wish.com on 02-04-21 and was received at 10:33am PST on 02-25-21.
* I tried to purchase the laser shown on this web page but was sent this one instead.
UPDATE: 00-00-00
PROS:
Beam is relatively clean, with few blotches, rings, or other evil little things (artifacts) in it
Batteries that it needs aren't expensive or that difficult to locate
NEUTRAL:
CONS:
Device is mislabelled (labelled as CDRH Class 3A when it should be Class 3B)
MANUFACTURER: Unknown
PRODUCT TYPE: Keychain portable laser
LAMP TYPE: Diode laser
No. OF LAMPS: 1
BEAM TYPE: Very narrow spot (it's a laser, remember?)
SWITCH TYPE: Momentary pushbutton on/off on barrel
BEZEL: Laser diode & lens recessed into a hosel for them
BATTERY: 3 LR44 button cells
CURRENT CONSUMPTION: 53.40mA
WATER RESISTANT: No
SUBMERSIBLE: ¡¡¡HUSOOS CRISTO TENIENDO UNA MIERDA, NO!!! 
ACCESSORIES: 3 batteries
SIZE: 69.400mm L x 12.50mm Dia. (not incl. power button)
WEIGHT: 10g (0.350 oz.)
COUNTRY OF MANUFACTURE: China
WARRANTY: 6Unknown/not stated
PRODUCT RATING:
Red Keychain Laser * www.wish.com...*
Do you manufacture or sell an LED flashlight, task light, utility light, or module of some kind?
Want to see it tested by a real person, under real working conditions? Do you then want to see how your light did? If you have a sample available for this type of
real-world, real-time testing, please contact me at bdf1111@yahoo.com.
Please visit this web page for contact information.
Unsolicited flashlights appearing in the mail are welcome, and it will automatically be assumed that you sent it in order to have it tested and evaluated for this site.
Be sure to include contact info or your company website's URL so visitors here will know where to purchase your product.
This page is a frame from a website.
If you arrived on this page through an outside link,you can get the "full meal deal" by clicking here.