Looking to sell these as a set - these are the best entries from the Aira Compact and Volca series, respectively. Both are fun, surprisingly powerful, very small and very portable (S-1 has internal USB-chargeable battery, Volca Drum takes batteries; optional power cord not included).
The S-1 sounds amazing and is a great way to learn the basics of synthesis. Inspired by the legendary SH-101 and featuring a step sequencer. You can menu-dive for lots of fine control but honestly just messing with the knobs will produce great things. Very polished-sounding.
The Volca Drum is in the same sonic family as the Erica Synths LXR-02: very digital with lots of glitchy and punchy sounds. Also features a waveguide resonator to add body, customizable choke groups, two randomize functions, and better mute/solo functions than most Elektron boxes.