Open Music Labs Mixtape Alpha & Sony MX-14 Vintage Portable Mixer

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These in via the same seller.

Mixtape Alpha via this auction

Sony MX-14 via this auction

"Mixtape Alpha is the smallest synthesizer we could make without a prescription. It has a stylophone style input for continuous note generation, and 6 buttons for discrete notes. With 4 voices, 4 effects, and 5 note polyphony there is quite a range of expression. But, the best part is, you can record the songs you make, and trade mixtapes with your friends! Perhaps even better, it’s based on the ATmega328p, and can be hacked to make even crazier sounds than we came up with."

"Sony MX-14 Vintage Portable Mixer A Vintage Mixer for your Vintage Synths. Comes with adapter and can also run on batteries."

Update: A little trivia according to the seller, Tomita used a similar model mixer in some of his recordings, including "Snowflakes are Dancing". Looking at the back of the album you can see the Sony MX-16 and MX-12 listed. The MX-16 does look similar in design. Not sure about specs though. Regardless, it is an interesting bit of trivia.