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This review is from: Bright Green Laser Light Beam Pointer Pen 5mw Powerful Portable Mini Keychain
Pros: Very bright. Runs on a single AAA battery so you don't have to keep buying coin-cell batteries. Shorter in length than a standard laser pointer.
Cons: I have read that there are a lot of generic laser pointers that claim to be 5mW, but actually put out higher power, along with leaking out UV light. If this was made by one of the reputable "name brand" manufacturers, I'd have more confidence that this one doesn't have the same problem.READ FULL REVIEW
Pros: Works at 115200 baud to connect my Mac with a microcontroller. Running C code from the command line. Worked "out of the box" without having to install any drivers.
Cons: Cable could be a little longer for my needs.
Other Thoughts: Haven't tested it up to the maximum baud rate yet.READ FULL REVIEW
Pros: Bought to use with OpenWRT. I have two of these that have been running for 9 months at this point and they're going strong.
I upgraded from a WRT54GS and WRT54GL. These have more memory and are much faster.
I could be wrong, but as far as I can tell, you can't brick these. The installation of OpenWRT was pretty straightforward.
Other Thoughts: There is a header on the main circuit board with a serial port on it. I wired up a connector and mounted a DB-9 connector on the back panel. It works just fine, but the real purpose of this is to act as a serial terminal. If everything else fails, you can hook up a serial cable to the port and see what's going on as it tries to boot. You can also connect in to the console this way. As I said before, you really can't brick the router, so you really don't need this. I did it for another reason:
On my old WRT54GS, I had two serial ports, one of which I connected to a UPS. The WRT54GS ran NUT, and sent out network messages when the UPS was on battery. I intended to do the same with the WNDR3800. Because it only had one serial port, it will always output the console output to the serial port on boot. So, if the router reset, it would send a bunch of stuff to the UPS, changing the configuration of the UPS. Bottom line, the lack of a second serial port means that you really can only use the serial port for a console, or some device that can tolerate the output on boot.