The HOBOT-2S is a corded window cleaning robot that sprays a fine ultrasonic mist from two tanks, with a safety rope and a 20 minute backup battery. It is a fair buy when it is on sale near $299, as it was at Wellbots, but it is an older design, it must stay plugged in, and our main pick adds battery operation for a similar price.
What the HOBOT-2S is
The HOBOT-2S is a window cleaning robot from HOBOT. It holds itself to the glass with suction from a brushless DC motor, which HOBOT rates at 7 kg of ascending power, and moves at 12 cm per second HOBOT ↗. HOBOT says it cleans about 1 square meter every 2.4 minutes HOBOT ↗.
Its signature feature is ultrasonic spray. Nozzles mist water into particles about 15 microns across, and HOBOT says plain water works without detergent HOBOT ↗. The robot has dual water tanks that can be replaced as a module HOBOT ↗ Smart Robot Reviews ↗.
It runs on a 5 meter power cord HOBOT ↗. For safety it has a 4.5 meter rope rated for up to 200 kg of pulling force, and a backup battery that holds it on the glass for 20 minutes with an audio alert if the power cuts out HOBOT ↗. You control it with an iOS or Android app or the included remote HOBOT ↗.
What it does well
The ultrasonic spray is a real plus. A fine mist wets the glass evenly, which helps the cloth lift dirt rather than smear it. Smart Robot Reviews lists the dual tanks, ultrasonic spray and AI route planning as its main strengths Smart Robot Reviews ↗.
Safety features are solid for a corded robot. The 200 kg rated rope and 20 minute backup battery give you time to react if a plug is pulled or the power fails HOBOT ↗.
It handles different glass. HOBOT says it is designed for glass of any thickness, and an edge leakage sensor detects air escaping at the seals and edges of frameless windows HOBOT ↗. A pneumatic pad adjusts itself to keep contact with the glass HOBOT ↗.
Maintenance is simple. The tank module swaps out with one screw, the robot reminds you to clean it every 3 months, and it gets firmware updates over the air HOBOT ↗.
It is often discounted. Wellbots had it on sale for $299, down from $479, when we checked Wellbots ↗. Hands on testing on our side is in progress.
Where it falls short
It is corded only. You need an outlet within reach of a 5 meter cord for every window HOBOT ↗. Our main pick, the Ecovacs Winbot W2 Pro Omni, can run on battery or plugged in Winbot W2 Pro Omni ↗.
It is an older platform. Smart Robot Reviews calls it an older model with limited current stock, and says that if the price gap to HOBOT's newer SP10 is small, you should buy the SP10 instead Smart Robot Reviews ↗.
Several specs are not published. HOBOT does not give a suction figure, a noise level in decibels, tank capacity, weight or warranty on its product page HOBOT ↗. Smart Robot Reviews also found no explicit claim for framed and frameless or indoor and outdoor use on the 2S, unlike the SP10 Smart Robot Reviews ↗.
Like all window robots, it is not fully hands off. You still move it from window to window and attach the safety rope each time HOBOT ↗ Winbot W2 Pro Omni ↗.
Pricing and plans
Wellbots listed the HOBOT-2S at $299, down from a regular price of $479, and showed it in stock when we checked Wellbots ↗. Smart Robot Reviews describes stock as limited and verified an Amazon listing in September 2026 Smart Robot Reviews ↗. Prices for older models move a lot, so compare sellers.
There is no subscription. Ongoing costs are replacement cleaning cloths and, if you choose, HOBOT's window detergent, though HOBOT says plain water works with the ultrasonic spray HOBOT ↗. HOBOT's page does not state the warranty, so check the seller's terms before you buy HOBOT ↗.
Who should (and shouldn't) use it
- Good fit: buyers who find it at a deep discount and have outlets near their windows HOBOT ↗ Wellbots ↗.
- Good fit: homes with frameless glass, thanks to the edge leakage sensor HOBOT ↗.
- Good fit: people who prefer an app and a remote HOBOT ↗.
- Skip it if: you want a cordless robot you can carry anywhere HOBOT ↗ Winbot W2 Pro Omni ↗.
- Skip it if: the newer HOBOT SP10 costs only a little more Smart Robot Reviews ↗.
Alternatives worth a look
- Ecovacs Winbot W2 Pro Omni: our main pick, battery or corded, with a safety rope and 30 minute backup hold, listed at $499.99 and often less Winbot W2 Pro Omni ↗.
- Ecovacs Winbot Mini: our budget pick for small windows, mirrors and shower doors Winbot Mini ↗.
- Ecovacs Winbot W3 Omni: our upgrade pick for homes with lots of large glass Winbot W3 Omni ↗.
- HOBOT SP10: HOBOT's newer model, which Smart Robot Reviews names its best overall HOBOT for framed and frameless glass Smart Robot Reviews ↗ HOBOT SP10 ↗.
Where it appears
ComparedThe Best Window Cleaning RobotWhat’s good
- Ultrasonic spray
- Often discounted
- Established brand
What to know
- Limited US stock
- Corded only
Key features
- Dual ultrasonic water spray
- Dual replaceable water tanks
Questions people ask
Is the HOBOT-2S cordless?
No. It runs on a 5 meter power cord, with a backup battery that holds it on the glass for 20 minutes if power fails HOBOT ↗.
How much does the HOBOT-2S cost?
Wellbots had it on sale for $299, down from $479, when we checked Wellbots ↗.
Does the HOBOT-2S need detergent?
HOBOT says its ultrasonic spray works with plain water, though it also sells a window detergent HOBOT ↗.
Where this comes from
Checked Oct 9, 2026. Vendor pages describe their own products; independent sources add outside views. Hands on testing is in progress.
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