E-100 arranger, made by Roland, has 61 velocity sensitive keys. The main feature of the instrument is its polyphony allowing up to 64 voices. E-100 comes with 1.5 MB of flash memory and has a USB port. You can save up to 99 songs for further use or performing, and, of course, locate them into your computer via USB. The MIDI keyboard is compatible with such formats as GM2, GS and XG.

E-100 has a built-in metronome and 16-track sequencer. E-100 comprises a wide range of sounds, from standard drum kits (20 drum kits) to pianos (510 sounds). It is worth noting that the sounds of the piano were taken from Roland digital piano.

Built-in speakers sound excellent. A large, user-friendly backlit screen displays important values that help improve the workflow. The effects should be mentioned as well, the section includes: 8 types of reverb, 8 types of chorus, and 47 varieties of multi-effects. The rear panel is equipped with MIDI input/output, USB for file transfer, as well as 2 1/4 (6.3 mm) outputs.