Defective product and frustrating customer service – buy with caution
I bought a JISULIFE handheld fan that developed a terrible, piercing high-pitched noise (coil whine) across all speed settings, especially at high speeds. Since my girlfriend owns the exact same model and hers runs completely quiet, this is clearly an isolated manufacturing defect on my unit. When I contacted the seller's customer support, they tried to dismiss the defect as a "normal inherent sound" and repeatedly tried to talk me into accepting a minor partial refund (15% then 20%) instead of taking responsibility. They even admitted in writing to "manufacturing differences between units," yet refused to provide a free replacement or return label. Luckily, Amazon.de handles returns properly, so I was able to return it through them instead. The fan itself might be good if you get a working one, but the seller's customer support is terrible and tries to dodge basic warranty obligations.