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Power: 33W, Lithium-ion battery capacity: 2130mAh (built-in), Working time: 1 hours, Dust tank capacity: 0.6L
Aliexpress
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Price history and price alert
Here is price history (for all/most countries) for iRobot Roomba 890 Vacuum Cleaner.
Price records source(s): Gearbest
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You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).