LED on keychain
After playing with this, I found I can put the keyring on my middle finger and turn the light on one-handed. I can wear it like a ring, and not have to keep it in a pocket when using it.
The keyring may or may not fit your finger, (it is pretty decent size though, id=21mm), but if you put in on a ring that does fit, it is mighty convenient! Even over gloves!
I have also stuck a little circle of velcro on it and stuck it to my laptop to use as a laptop light. it works nicely there too.
How many uses for these can you find?
04/11/2012 Note: We got a new shipment in and got a really good price on them. Because of increased shipping costs, we were unable to lower the price of a single one, but have dropped the price of 5 to $12 shipping included in the US.
really nice! Unlike most of the tiny LED lights
on keyrings. These have both a press on-release off
switch AND an on-off button so that they can
remain on while you do other things. The led is
has a medium brightness. I am finding these very
useful around my observing site.
Buy a bunch; give them to your friends!
In my tests, the battery lasted over 100 hours (continuous usage). The battery can be replaced (4 screws) and it takes a CR3032 3V lithium battery. These are very common. This isn't a "throwaway" item.
one keychain $4 includes US shipping
5 keychains $12 includes US shipping.
Flashing red LEDs with 9 volt battery connections
|When at a public
starparty there is a real risk of someone tripping over your
tripod or equipment box. When I have been alone I have
tripped over my own equipment as you may well have.
This blinking red led is attached to a 9 volt battery
connector. It will flash for months if needed on a single
battery. The connection will actually work from 3
volts to 9 volts, but it comes set up for a standard 9 volt
battery. Buy a few for using as a warning
device. $1 shipping is required no matter how many you
buy. The devices cost $0.80 each. (Because I am
just an amateur, the turned on LED in my picture looks
white. It is not, it is red. )
|$1.00 shipping in the US is
added no matter how many you purchase. Each 9volt
flashing red led set up costs $0.80. Ask for shipping
costs to foreign countries.