This is an IBM31T1100A IRDA transmitter module. To my best knowledge (and user experience) it is compatible with the standard TFDS6000 module, which is the upwards compatible high-speed version of the TFDS4500.
This is a surplus product. It was obtained from a surplus store, from an inventory or from any other secondary source. You can expect this product to be in good working condition, but it can show signs of being handled, shipped, repackaged etc. The supply of a surplus article can suddenly run out, or the price can change. Get it while it is available.
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