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Including free 5-year guaranteeIncluding free 5-year guarantee
Yard Force Compact 400Ri - robot lawn mower (2020 model)
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Yard Force Compact 400Ri - robot lawn mower (2020 model)

Including free 5-year guaranteeIncluding free 5-year guarantee

Unit price:


* Prices in GBP incl. VAT and delivery, if applicable

Due to a high volume of orders, the delivery time of our delivery service providers may be extended. Read more
  • Delivery time: 3 to 5 working days.

  • Express shipping available

    You will have the opportunity to select DHL Express. Orders which are placed until 12.00 p.m. and are in stock, will be shipped on the same day. The additional fee depends on your delivery address and cart.

Including free 5-year guaranteeIncluding free 5-year guarantee

More information about product

The Yard Force Compact 400Ri: Compact an also smart

The robot lawn mower for small gardens is full of technology. Its ultrasonic sensors ensure a save mowing on the property, detecting obstacles right in time to avoid collision. With many technical advantages, the Yard Force 400Ri can handle up to 400 m2 and a gradient of 30 %. The robot grass cutter can also be controlled comfortably via smartphone app, allowing the lawn to be mowed very comfortably. With the USB port of the Yardforce Compact 400Ri, upgrades can be easily carried out.


Due to a high volume of orders, the delivery time of our delivery service providers may be extended. Read more
  • Delivery time: 3 to 5 working days.

  • Express shipping available

    You will have the opportunity to select DHL Express. Orders which are placed until 12.00 p.m. and are in stock, will be shipped on the same day. The additional fee depends on your delivery address and cart.


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Adapter EU to GB
Adapter EU to UK
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Product description

A robot mower full of technical functions.

iRadar technology

The iRadar technology and also the ultrasonic sensors help the Yard Force 400Ri to detect obstacles. By detecting the obstacles at a distance of about 0.2 to 2 m, it can dodge them early and avoid a collision. This is a big advantage when comparing this model with others because most robots only detect obstacles after a more or less soft collision.

Always “up-to-date” Always “up-to-date”

Always “up-to-date”

The manufacturer provides corresponding firmware updates via download - these can be quickly installed on the Yard Force Compact 400i. Troubleshooting is just as easy thanks to the USB port on the robot lawn mower itself.

One app for all models One app for all models

One app for all models

You can connect the Compact 400Ri lawnmower robot to a WLAN and control it conveniently via App. The app is now available for iOS and Android and is published in 13 languages. Many Yard Force models can be controlled using the "Mowap App".

iRadar sensor iRadar sensor

iRadar sensor

The models of the Compact series are equipped with an iRadar, a so-called ultrasonic sensor, thus offering maximum safety. This enables the robot mowers to detect obstacles at a distance of approximately 20 cm (minimum height 12 cm) and avoid collisions and possible injuries.

Controlling the Yard Force Compact 400Ri with an appControlling the Yard Force Compact 400Ri with an app

Controlling the Yard Force Compact 400Ri with an app

With the smartphone-app, the robot grass cutter can easily and comfortably be programmed. You can also adjust the settings of the Yard Force Compact and set the mowing times via app. The app is free for Android and iOS and is also available in 13 languages.

Simple upgrades and diagnoses

The USB port makes it easy to upgrade the Yard Force Compact 400Ri. Diagnostics can also be made on the robot mower in a matter of seconds. Therefore, it is not necessary to send the robot in for an update, as was the case with many models in the past.

The practical robot lawn mower for small gardens

Perfect for 400 m2 and 30 % slopes

The compact robot lawn mower is suitable for gardens up to 400 m2. With the built-in 20 V / 2.0 Ah rechargeable battery, the Yard Force Compact can handle gradians of up to 30 %. Even complex gardens are no problem for the robot grass cutter.


Easy to handle with “One Click”

The One Key Start and One Key Home modes make the robot mower very easy to use. So it is possible to start and park the robot with only one click. It can hardly get any easier!  


A healthy lawn through the mulch function of the Yard Force 400Ri

The height-adjustable (between 20-55 cm) blades and 16 cm cutting width allow the robot grass cutter to cut your lawn to the perfect height. The mulch that falls to the ground fertilizes the lawn and keeps it healthy.  

Installed in your garden in a short timeInstalled in your garden in a short time

Installed in your garden in a short time

Before you can operate the robot lawn mower, you need to install the boundary wire which serves as a border for the robot. The installation and start-up is particularly easy and can be carried out by yourself. The user guide will help you with it. Boundary wire, wire connectors and other accessories are included in the scope of delivery.

Scope of delivery

Yard Force Compact 400Ri
Yard Force Compact 400Ri - robot lawn mower (2020 model)
  • Charging station
  • Boundary wire (100 m)
  • Pegs (120 pcs.)
  • Wire (9 m)
  • Replacement blades ( 3 pcs.)
  • Replacement screws ( 3 pcs.)
  • Connectors (3 pcs.)
  • Distance ruler
  • Manual

Technical details

More information
Model NameYard Force Compact 400Ri (2020 model)
Gradient:± 30 % (14°)
Lawn complexity:Simple
Dimensions44.0 x 38.4 x 20.6 cm
Weight (approx.):7.4 kg
App-controliOS, Android
Voice serviceAmazon Alexa, Google Home
Mowing modeThree rotating blades
Cutting height20 - 55 mm in 3 steps
Cutting width16 cm
Mowing in rain:Rain sensor (adjustable)
Charging time100 Min.
Battery runtime60 Min.
Battery typeLithium-ion (20 V / 2.0 Ah)
Battery guarantee:1 year
Product guarantee:5 years
Boundary optionBoundary wire
Safety:Obstacle detection, lift and tilt sensors, pin code
Special features:• App-control • USB-interface for software-updates • Radar-sensor for obstacle detection

Product questions (0)

Product questions
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Customer Review(s)

5-year guarantee5-year guarantee

With their technical sophistication and excellent range of features, robots from myRobotcenter never fail to impress. Our robots are guaranteed to provide you with more free time and a better quality of life. Guarantee is also the key word when it comes the longevity of our products. Thanks to their sophisticated, tried and tested technology, our products have proven to be extremely reliable and free of faults. If a design fault should arise, then you can rely on a guarantee that – with many products – extends far beyond the statutory minimum.


Extension of the guarantee to 5 years

Our products come with a manufacturer's guarantee (generally 2 years). At myRobotcenter you get an even longer guarantee on many products: we extend the guarantee period to 5 years.


Complete security over many years

Our 5-year guarantee on labelled products is both a mark of quality and a very special service for you as our customer. In addition to the respective guarantee, we provide  you with all the details about the conditions of our guarantees and which services you can expect from us.


What does the guarantee cover?

The 5-year guarantee covers devices bought from us when accompanied by a receipt or another document that proves the validity of the 5-year guarantee. The 5-year guarantee ends five years after the device was purchased. The guarantee is valid for guarantee claims that occur in United Kingdom.


A guarantee claim is valid when the device purchased by you is damaged or destroyed, as a result of the following causes:

  • construction fault, calculation error, casting defect, material defect and production fault

  • direct effects of electrical energy as a result of a ground fault, short circuit, excessive increase in the current strength, electrical arc-over, formation of electrical arcs, insulation faults, excess voltage and the like.

Excluded from the guarantee is damage caused by external influences, such as a bounce flash in the circuit or fire damage. Such externally induced damages can be covered under certain circumstances by your household insurance and may include:

  • measuring, controlling and safety device failures

  • excessive pressure other than explosions

  • implosion and other effects of insufficient pressure

  • lack of water in steam boiler and other apparatus

  • bursts due to centrifugal force


Within the framework of the extended guarantee, operating errors are covered insofar as they impair the functionality of the product and do not represent a contravention of the operating instructions. For such cases we shall charge an excess of 84 GBP including VAT.


What is NOT covered by the guarantee?

  • Wear and tear, and damage to wearing parts and batteries (the battery is only covered by the manufacturer's guarantee)

  • Damage that does not impair the technical function of the device, e.g. scratches and scuffs.

  • Damage or destruction due to intentional or grossly negligent acts or omissions on the part of the purchaser or other users of the device.

  • Damage or destruction caused by improper installation/assembly, by improper repairs/adjustments, by improper, non-intended or unusual use or cleaning of the device – especially when the manufacturer’s instructions are not followed – and by operating errors.


What service do we provide in valid guarantee cases?

  1. When repair is technically and objectively possible and the costs of repair do not exceed the current value of the device (see clause 3), the device shall be repaired professionally and the costs incurred in the repair reimbursed by the guarantee.

  2. Should repair be technically or objectively impossible or uneconomical (total write-off), you shall receive a replacement device of the same kind and quality up to the amount of the current value (see clause 3). The damaged or destroyed device is returned to us and becomes our property.

  3. The current value of your device is 50% of the purchase price in the 3rd year after conclusion of purchase contract, 40% in the 4th year and 30% in the 5th year of the purchase price as stated in the receipt.


Is your device broken?

Just ask us for help. We will support you with the repair request.

  1. In the matters of a needed repair, a skilled and trained team in service and repair department from us or from the manufacturer itself, will gladly be there for you with advice and act to the side.

  2. Please take care of packing the robot carefully to avoid damage.

  3. Enclose a detailed description of the fault as well as the invoice together with the 5-year guarantee certificate.

  4. The robot must be fully postage paid at and sent to the mentioned address.

  5. Transport costs are paid by you and will not be refunded. We recommend that you keep the postage receipt.


Correct as of: May 2020