[0.27 lb] You basically get a three voice analog synth with easily accessible modulation features that syncs with the other Volcas and runs on batteries.

It does tend to tear through batteries in my experience but that goes for all the Volcas and you can always plug it in.

[Handheld Only] I’ve owned Synthesizers since 1972. I currently own quite a few from several manufacturers, Behringer, Roland, ASM, Elektron, Modal, Teenage Engineering and Korg (Volca FM 2 and Sample 2) to name a few.
 
10 years in the marketplace this Volca Keys has really held up to the test of time.
 
Marketed as an “Analogue” Synthesizer in reality the control signals are generated digitally with the CPU using a 10-bit DAC giving it near-analogue resolution. So this is a Subtractive Hybrid unit; an analogue sound engine with digital control so dial tweaks and note info can be recorded into the sequencer/accessed over MIDI. By the way, this is a good thing not a negative at all.
 
It’s a pretty easy to use, straightforward, with no menu screen, pretty much a dial per function arrangement. Great for beginners but powerful enough for experienced users.
 
I did notice notice that some dials are translucent and some solid. As a rule I found the solid dials' movements can't be sequenced, but the translucent dials can be sequenced and are backlit red plus flash to denote which parameters are active or recorded in a 'motion sequence' (motion sequencing captures dial movements into the sequencer).  The tempo dials flash in time with the internal/MIDI-clocked tempo and each key/sequence step has its own LED too, convenient for letting you know what's happening at a glance within complex sequences
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It has 3 sawtooth wave oscillators & produces great upfront three-note chords, dirty lead/bass lines, ring modulated sounds and detuned unisons. It also features octave/fifth mono modes, a versatile tempo-syncable analogue-style delay that does reverbs/bit-crushing (from the Monotron Delay) freeform unquantised flux recording and 1/1, 1⁄2 and 1⁄4 tempo modes.
 
It uses the great MiniKORG700s filter. The LFO has 3 waveforms: sawtooth, square & triangle which make for some great modulation variety.
The Volca Keys really packs a lot in, it's very versatile and a true value at such a low cost.

[Zipper] LOVE MY VOLCAS! GREAT PRICE, EASY TO USE! I started with the KORG Volca Beats, and quickly added the Volca Keys, then the Volca Bass. I love the way they sync. I also like using knobs and manual/mechanical manipulation, which is part of the fun of the Volca series: twirling oscillators and noise filters in real time. Build quality is decent (particularly for the money), and these devices are super-easy to use. The analog tones are versatile: fat, warm and spooky/spacey as you'd want them to be. Watch the YouTube tutorials for some great demonstrations of the capabilities of these units- Hearing is believing!

[Handheld Only] Great sound and functionality. This is one of the oldest models so it doesn't get a lot of love but it can do a lot more than you think if you take the time to learn it. All the volcas jam well together and I definitely recommend this, but get the FM first if you have a tight budget.

[Empty] The Korg Volca Keys is a fantastic sounding analog poly synth even if it were more expensive. This can really get pretty fat too. I love the Volca Keys so much that I made a sample library with it using motion recording and doing two passes of each sound to give me stereo imagining of the LFO phase. If there's one thing that's greatest about it, it's the filter. Korg filters are the best and this filter, based on the miniKORG 700S, is no exception. The different oscillator modes give it a wide range of sounds and one of my favorite features of this is the pitch envelope. The pitch envelope just really sets it apart from synths lacking such control. I've used this with its sequencer and that's totally fun for DAWless jams. I'm now also enjoying using it in sampled form. Every parameter is motion recordable except oscillator mode & resonance and you can motion record all other parameters without limit. I hope to always have a Volca Keys and I just know I'll only ever get rid of it if Korg comes out with a Volca Keys 2.

[Zipper] I can do much more than i expected with this one!
Volca series is just what I needed.

[Zipper] What a great little synth and it's priced right.Very versatile and with the wealth of tutorials available even a synth noob like me can jump in and start making interesting noise.I love it.B H had the best price around.

[Handheld Only] Fits well and is well constructed. Perfect to throw into a backpack. Lays flat when open so you can play a volca without taking it out.