Comparison Liectroux S9 vs Hutt C65

 

The backup power system uses a built-in battery to keep the window-cleaning robot attached to the glass in an emergency after the mains power goes out. It does not allow full cleaning to continue, but keeps the device attached to the glass and gives you time to remove it in the event of a sudden power outage or accidental cable disconnection. The specified time indicates how many minutes the system can maintain the robot’s adhesion to the glass without mains power.

The noise level indicates how loud the window cleaner operates: the lower the value, the more comfortable the device is to use indoors. Models quieter than 60 dB are comparable in volume to a calm conversation, the 60 – 65 dB range is already clearly audible, and devices above 65 dB may interfere with work or rest nearby. A robot remains audible throughout the entire cycle, whereas a handheld vacuum makes noise only while directly collecting water.

Smartphone control allows you to control the window-cleaning robot through the dedicated mobile app. From your phone, you can start and stop cleaning, select a mode, change the direction of movement, and monitor the device status—the exact set of commands depends on the model. The smartphone connection can be established via Bluetooth—for direct control nearby without a router—or via Wi‑Fi, which provides a greater connection range and may support remote access over the internet.

— Additional nozzle. The second, narrower suction nozzle is designed for tight areas where using the main working edge is inconvenient. It makes it easier to clean small window sashes, sectional frames, and narrow mirrors.

— Sprayer. A hand sprayer with a reservoir for water or cleaning solution that evenly wets the glass with fine droplets. It helps soften dried-on dirt and prepare the surface for wiping and subsequent collection of the liquid by the window vacuum.

— Extension pole. A telescopic or sectional handle that increases the operating range of the window vacuum or the device used to apply cleaning solution. It allows you to clean the upper areas of tall windows, glass partitions, and other hard-to-reach surfaces from the floor, without a stepladder.

— Remote control. Allows you to start, stop, and direct the window-cleaning robot without a smartphone. The set of commands varies by model, but a separate remote is convenient for quick local control and does not depend on mobile app compatibility.