inputs.text: fragile unit - fragile unit say \\please not counterclockwise adjustment test module case high input voltage damaged even damaged\\ truething constitutes high input voltage not say 5 6 popped low enough input voltage still properly energize unit set output voltage switch desired input voltage without destroying unit not say reviewers say not pop maybe used \\walking up\\ fragile chinese unitsall say pretty fragile well underspecified wrt proper setup proceduresbefore ding \\they told so\\ consider exact work flow went lab bench