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Not a standard plug. 
The plug on these is a stereo plug, not a mono like most standard IR emitters. Since the ground is at the first inner ring, it does not work on most devices that use a mono type jack. TiVos need the mono jack.
Some hacking info... 
For those hacking this thing: Seems to like a bit over 3 volts, applied with positive to the tip and ground to the (middle) ring of the plug. If the plug's sleeve does anything, I can't tell. Snipping into the wire, red is positive and white is ground, with bare wire as the inert sleeve. Seems like the LED has a 45 degree or so visibility.
Time Warner DCH3200
I am trying to wire the infra-red blaster directly on to the front panel of the STB. (I want to hide the STB out of site and run the blaster to the TV. I want to solder in onto the 3 prongs of the existing IR receiver within the unit. This is because the unit does not have a mini PL socket to plug in the blaster. I think the STB has a TSOP21 soldered onto the board. I do not know what pins I should solder the Red White and unshelieded wire to. Any ideas?
Very good 
Bulky, but sticks very well and the clear plastic enclosure acts as a prism, allowing continued use of the original remote without the blaster getting in its way. Good, cheap emitter for Crestron boxes.
