Key counts in the results range from compact 49-key controllers up to full 88-key digital pianos, with 61-key and 88-key options appearing frequently.
USB MIDI is common across the listings. Some instruments also advertise Bluetooth MIDI and Bluetooth audio. At least one controller includes a full-size 5‑pin MIDI output in addition to class‑compliant USB.
Polyphony values shown range from 32‑note polyphony on a portable model up to 256‑note polyphony on a digital grand, with another console model listing 240‑note polyphony.
Many full digital pianos and several controllers include Split and Layer modes plus learning tools. The digital grand and console models mention Split/Layer modes and built‑in learning/LED tutor systems, and at least one controller lists Split Mode and Layer Mode as performance features.
Compact controllers commonly appear as 49‑key or 61‑key models with semi‑weighted keybeds. Some of these compact controllers also include aftertouch and assignable zones useful for studio workflows.