HOBOT 2S · HOBOT 388 Ultrasonic

You gain stable autonomous cleaning of a pane once positioned, but you lose multi-window autonomy. Manual placement is the structural constraint.

Dual ultrasonic spray nozzles wet the pane evenly, but they draw from one tank, so a large job means taking the unit off the glass to refill.

You are freed from the ladder, but the machine is never untethered: a 4.5 m safety rope anchored to a fixed object indoors and a permanently attached 5 m mains cord are both part of every session.

Applying water as a mist rather than a soak keeps run-off off the sill, but a saturated pad on consecutive heavily-soiled panes still requires a mid-session swap that interrupts the automated workflow.

Coverage within a single pane is systematic and unattended; the unit cannot advance to the next pane without the owner relocating it and re-anchoring the rope.

Hands-off scheduling automation seekers

The app and the bundled remote control a session in progress, but every pane still needs the unit lifted, placed and started by hand. Owner involvement is per window, not per house.

Multi-story buildings with distributed windows

Frequent repositioning between stories becomes repetitive labor, and each new position means re-anchoring the rope indoors and finding a socket within 5 m.

Owners with irregular or architectural detailing

The Edge-Leakage Sensor works by detecting the air leak when the pad breaks its seal at an edge, so it reads frameless glass as well as framed. Deep recesses and heavy architectural detailing still limit where the unit can be placed and raise how often it needs repositioning by hand.

Properties with limited nearby water supply

The unit carries a single water tank module refilled by hand, which on a large job means taking it off the glass and walking back to a tap. HOBOT publishes no per-fill coverage figure.

Users expecting hands-free multi-window automation

Every pane requires manual placement, pad attachment, and safety rope anchoring. The unit automates the scrubbing path within a pane but does not eliminate per-window setup effort.

Homes with textured, frosted, or divided-pane glass

Surface irregularities break the suction seal. Owner reports confirm the unit detaches or loses path on patterned or divided glass, which is a safety risk in addition to a cleaning failure.

Buyers seeking a fully autonomous set-and-forget appliance

Window cleaners in this category require active supervision per session. The 388 automates path coverage within a pane, not the overall cleaning workflow across a home.

Owners with small standard windows cleaned rarely

Manual squeegee effort on small panes is often faster than the 388 setup cycle. The time-savings case is strongest on large or difficult-to-reach glass.