The Dryer Module add-on from Roborock (original), for the O35 Onyx3R oborock S7 Pro Ultra /Roborock S7 MaxV Ultra Models. Roborock S7 MaxV Ultra Dock Hot Air Dryer Module - Full Test Results! The reason is probably due to differences in hardware: the S7 MaxV model has an IR device that S7 Pro model doesn't.
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Dryer Module with Empty Filling Base, Drying Time Adjustment, Intelligent Drying, Compatible with Roborock S7 MaxV Ultra/S7 PRO Ultra (Color : Drying) : Home & Kitchen
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High-speed heating and air drying: The dryer module brings drying efficiency to your empty cleaning and filling dock. The maximum heating of 45°C and the high-speed centrifugal blower of 3160rpm provide a more complete hands-free experience. Multi-sensor protection: The design has a protector, a temperature sensor, and an infrared communication sensor, all of which work together to ensure that the floor of the unit is prevented from overheating.
Dryer Module with Empty Filling Base, Drying Time Adjustment, Intelligent Drying, Compatible with Roborock S7 MaxV Ultra/S7 Pro Ultra (Color