Karcher OC represents a series of portable and mobile pressure washers that are drastically different from other lines by the German manufacturer. This is not a powerful pressure washer for the patio and car, but a compact battery-operated rinser for use without water and power access: outdoors, hiking, camping, after a bike ride, or walking the dog. The series is aimed at active people who need to quickly wash off dirt from a bike, shoes, gear, stroller, or pet right on the spot — before it ends up in the car or home.

The key difference of the series from traditional washers is operation without connection to a water supply and outlet. The built-in lithium-ion battery usually provides up to 15 – 20 minutes of continuous operation on a single charge. This is enough for a quick rinse after a typical bike ride or walk in the park. Charging via a standard cable takes about 3 hours. The removable water tank is filled in advance at home, in the car, or at any water source, including through an adapter to connect to a regular garden hose. The pressure in the series is intentionally low — about 5 bar. This is a deliberate design decision: low pressure allows for washing sensitive surfaces (brake discs, electronic components of the bike, dog's paws, baby strollers) without risk of damage. At the same time, water consumption is minimal, making the limited tank volume practical even for multiple cleaning items. The spiral hose is stored under the removable tank, and the gun is fixed on the body — the device is ready to work and can be put back in just seconds.

Different model options are provided within the series. The OC 3 is the most compact and lightweight option for minimalist tasks, while the OC 6-18 is a more serious solution with increased water pressure (24 bar). Devices with the "Car" suffix come with a car charger. And the main feature of the Foldable washers is the ability to fold down to a minimal size for packing in a backpack or trunk — this is the most compact option when folded, especially relevant for camping and hiking.