The Roland AX-1 is a keytar

Keytar

A keytar is a relatively lightweight keyboard that is supported by a strap around the neck and shoulders, similar to the way a guitar is supported by a strap. Keytars allow players a greater range of movement compared to conventional keyboards, which are placed on stands...

 (a shoulder-held clavier keyboard worn like a guitar

Guitar

The guitar is a plucked string instrument, usually played with fingers or a pick. The guitar consists of a body with a rigid neck to which the strings, generally six in number, are attached. Guitars are traditionally constructed of various woods and strung with animal gut or, more recently, with...

),
produced by Roland

Roland Corporation

is a Japanese manufacturer of electronic musical instruments, electronic equipment and software. It was founded by Ikutaro Kakehashi in Osaka on April 18, 1972, with ¥33 million in capital. In 2005 Roland's headquarters relocated to Hamamatsu in Shizuoka Prefecture. Today it has factories in Japan,...

, that does not produce its own sounds but controls other devices (such as keyboards, sound modules and samplers) via MIDI.
The industrial design of the Roland AX-1 was done in a basement studio in London, U.K. by two designers, David Sherriff and Andrew Leggo, who ran a small design studio called Space Logic.