Hiwatt Echo theremin with onboard delay: demo and review - YouTube
Echo Theremin - YouTube
Rare) HiWatt Echo-Theremin | Reverb
HIWATT ECHO THEREMIN ハイワット エコーテルミンの通販|ラクマ
HIWATT Echo Theremin fun! Rare, short-lived, awesome mini theremin I've owned since they first came out in the early 2000's. Really cool and unique... | By Enfield Studios, Lessons & Repairs -
HIWATT ECHO-THEREMIN EFFETTO PER CHITARRA | Musical Store 2005