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You put a something (a ball? something really light) and the compressed air pushes it through the tubes
Texas Instruments Engineering and Innovation Hall
Pressing one or more of these lighted buttons will change the music being played (and the corresponding video above too)
Texas Instruments Engineering and Innovation Hall
Purchased New-In-Box for $16 off ebay.com, this device from the late 1990's powered up but had LCD problems, as you can see in the photo.
The TI PS20/20 was a pocket sized electronic personal organizer and phone book, with appointment memos, a clock, and a calculator. It had 1 KB of memory to store the data, which was very small even for pocket organizers. This model had a colorful semi transparent plastic shell probably inspired by the famous iMac G3.