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Compact 400RiS

(3 customer reviews)

The Yard Force Compact 400RiS Robotic Lawnmower is the perfect solution for keeping your lawn in top shape all year round. Fully automated lawncare at the touch of a button, the i-Radar technology allows the machine to move effortlessly around your lawn while avoiding obstacles.

  • App Control
  • Ideal for gardens up to 400m²
  • i-Radar – Active Safety Ultrasonic Sensor technology
  • Rain sensor
  • Tackles inclines of up to 30%

£514.99 inc VAT

2 (+1) Years Warranty

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Easy Installation

The set up process couldn't be simpler, with straight forward instructions and an easy to program control panel, installation is on average 45 minutes depending on your garden size and shape.

App control

Manage your lawn from any location with the easy to operate CloudHawk App. Adjust the working schedule, change cutting zones and send back to charge all from the convenience of your phone.


This advanced technology provides peace of mind by allowing the robot to move freely around your lawn. The iRadar ultrasonic sensors detect obstacles up to 60cm, and will change route before a collision.

Product Features

Garden size

Auto Stop Sensors

Rain Sensor

16cm Cutting Width

30% Slope Capacity

Additional Features
  • 400m² working area suitable for city gardens
  • i-Radar – Active Safety Ultrasonic Sensor technology, the most advanced feature in robotic mowing
  • App control – intelligent technology enables control from any location
  • 20V Lithium-Ion Samsung battery and 16cm cutting width
  • Variable cutting height adjustment, ranging from 20-55mm
  • Rain sensor enables Compact 400RiS to go back to the charging station automatically
  • Additional protection with built-in sensors: lift, obstacle, turnover, tilt
  • Tackles incline of up to 30%
  • It can mow day and night, thanks to its quiet operation.
Product Specifications
Article Number Compact 400RiS
Battery Capacity 2.0Ah
Power 20V
Garden size 400m²
Cutting Width 16cm
Cutting Heights Variable
Cutting Height Range 20mm-55mm
Cutting System 3 x Steel Blades
Charge Time 100min
Run Time 60min
Dimensions 440 x 384 x 206cm
Weight 7.4kg
Accessories 100m boundary wire, 120 wire pegs, 3 fixing pins, 3 spare cutting blades, 9m charging cable
Slope 30%
Sensors lift, obstacle, turnover, tilt, rain, radar
Advanced Performance WiFi, App, PIN code
What's in the box
  • 1 x Compact 400RiS Robotic Lawnmower
  • 1 x Charging Station
  • 1 x 100 m Boundary Wire
  • 120 x Boundary Pegs
  • 1 x 9 m Extend Cable
  • 3 x Spare Blades
  • 3 x Blade Screws
  • 3 x Boundary Wire Connectors
  • 1x Spacer Ruler
  • 1 x Instruction Manual
Delivery & Returns

You have 30 calendar days from the day you place your order to notify us that you want to cancel and return your item to us. To be eligible for a full refund including any delivery charges you incurred, the item must be unused and in the same condition that you received it and in its original packaging. Please note that we are happy to arrange the return carriage, but we do ask that you cover the cost of £12 per order for all products.


With a 2 year warranty (extending to 3 years on registration) and a support team behind you, you’ll have years of hassle free mowing.

Customer Reviews

3 reviews for Compact 400RiS

  1. Bristol Lavis

    Living with the 400Ri
    I purchased the above mower in June 2021 so it is going into its 3rd season. Have found it relatively easy to install and set up, also it does have features that a lot more expensive robotic mowers do not have.
    It has cut our back lawns which are complicated by their layout and obstacles almost faultlessly since we have had it. It has on very few occasions got stuck mainly on returning for charging, when it’s returning the ultra sonic sensors are turned off so if something is in its way like an apple it can get stuck! This is a minor problem, one other thing to look out for it does not have an easy replaceable battery so would need to be replaced at service or if you are capable y diy. After the time we have had it it is still capable of running for almost 2 hrs before it needs to charge itself.
    Very pleased would recommend

  2. Peter Slither

    I received my Compact Robot this weekend after spending much time researching which robot to buy. It was a little trickier than your average lawnmower to set up, however, once it is in action it is so easy. I can relax and spend time looking after other areas in my garden rather than the lawn. I’m not sure what the cat thinks of it though!

  3. Gemma Louise

    I recently purchased a Compact 400Ri Robotic Lawnmower, I was surprised how easy the installation was. It would be nice to have a garage f some sort to keep it protected from the elements. The App is handy and it also helps keep cats off may lawn! All in all I would definitely recommend.

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