Hybrid UV Sterilization Humidifier (Large Capacity)

This is a hybrid humidifier.

Size
Main unit: Approx. W 25.6 x D 20.0 x H 34 cm
Cord length: Approx. 1.4 m

Specifications
Power supply: AC100V 50/60Hz
Power consumption: Approx. 15W (heater function OFF, low humidity output) / Approx. 280W (heater function ON, high humidity output)
Tank capacity: 6.5L
Humidity output: Heater function ON approx. 550ml/h, Heater function OFF approx. 300ml/h
Continuous humidification time: Approx. 60 hours (heater function OFF, low mode)
Applicable floor area: 10 tatami mats (Japanese rooms), 17 tatami mats (Western-style rooms)

Product reference page
https://item.rakuten.co.jp/dondon/jxh-002/?scid=wi_ich_ichibaapp_weburl_share

Purchased in 2021 and used during winter until last year.
There are no operational issues, but there is an unusual noise when starting up.
It only occurs during startup and becomes quiet after a while.

Please understand this before purchasing.