1. Introduction
Thank you for choosing the Osann One360 car seat. This manual provides essential information for the correct installation, safe use, and maintenance of your car seat. The Osann One360 is a versatile car seat designed to accommodate children from birth up to approximately 12 years (0-36 kg), covering Group 0+/1/2/3. Its 360-degree rotation feature simplifies placing and removing your child.
2. Safety Information
Always prioritize your child's safety. Read and understand all instructions before installing and using the car seat. Failure to follow these instructions can result in serious injury or death.
- Rear-Facing Use: The car seat must be used in a rear-facing position for children from birth up to 18 kg (approximately 4 years). This provides optimal protection for infants and toddlers.
- Forward-Facing Use: Forward-facing use is permissible for children from 9 kg to 36 kg.
- Harness System: Always secure your child with the car seat's internal 5-point harness system until they reach 18 kg. For children weighing 15-36 kg, the internal harness should be removed, and the child secured with the vehicle's 3-point seat belt.
- Installation: Ensure the car seat is correctly installed using either the ISOFIX system with Top Tether or the vehicle's 3-point seat belt, as appropriate for the child's weight group.
- Vehicle Compatibility: Verify that your vehicle is compatible with ISOFIX installation. Consult your vehicle's owner's manual.
- Airbags: Never install a rear-facing car seat on a front passenger seat equipped with an active airbag.
- Damage: Do not use the car seat if it has been involved in an accident, even if no visible damage is apparent. Replace it immediately.
3. Product Features
The Osann One360 car seat offers a range of features designed for safety, comfort, and ease of use:
- 360-Degree Rotation: Allows for easy access to place and remove your child from either side of the vehicle.
- Adjustable Headrest: Features a 10-position height-adjustable headrest to grow with your child.
- Automatic Harness System: The height of the 5-point harness automatically adjusts with the headrest, ensuring a correct fit.
- Comfort Inserts: Includes a removable comfort insert and a baby wedge for newborns, providing optimal support and comfort.
- Recline Positions: Offers 5 sitting and reclining positions for your child's comfort during travel.
- ISOFIX Connectors: Retractable ISOFIX connectors ensure secure and stable installation in the vehicle.
- Material: Constructed from a durable polyester blend.

This diagram highlights the main features: removable comfort insert, 10-position height-adjustable headrest, harness and buckle padding, automatically adjusting harness system, 360-degree rotation for easy entry, and a baby wedge for use from birth.
4. Setup and Installation
Proper installation is crucial for safety. Follow these steps carefully based on your child's weight and age.
4.1. Weight Group Overview

This image illustrates the different usage modes: rear-facing for 0-18 kg, forward-facing for 9-18 kg (with internal harness), and forward-facing for 15-36 kg (with vehicle belt).
4.2. Installation with ISOFIX and Top Tether (0-18 kg Rear-Facing, 9-18 kg Forward-Facing)
- Prepare the Car Seat: Ensure the internal harness is correctly adjusted for your child's height. For newborns, use the baby wedge and comfort insert.
- Locate ISOFIX Anchors: Find the ISOFIX anchor points in your vehicle's back seat.
- Extend ISOFIX Connectors: Press the release buttons on the car seat to extend the ISOFIX connectors.
- Attach ISOFIX: Push the ISOFIX connectors onto the vehicle's anchor points until they click securely into place. Check for green indicators to confirm correct attachment.
- Push Car Seat Firmly: Push the car seat firmly against the vehicle's seat back to remove any slack.
- Attach Top Tether: Locate the Top Tether anchor point in your vehicle (usually behind the back seat or in the trunk). Attach the Top Tether strap hook to this anchor point.
- Tighten Top Tether: Pull the Top Tether strap to remove all slack, ensuring the car seat is firmly secured and stable.
- Final Check: Wiggle the car seat at the ISOFIX points. It should not move more than 2.5 cm (1 inch) in any direction.

This image demonstrates how to securely and easily install the car seat in the car using ISOFIX and the Top Tether.
4.3. Installation with Vehicle's 3-Point Seat Belt (15-36 kg Forward-Facing)
For children weighing 15-36 kg, the internal 5-point harness must be removed. The child is then secured directly by the vehicle's 3-point seat belt.
- Remove Internal Harness: Follow the instructions in the maintenance section to safely remove the internal 5-point harness.
- Position Car Seat: Place the car seat on the vehicle's seat.
- Route Seat Belt: Guide the vehicle's 3-point seat belt through the designated belt guides on the car seat. Ensure the lap belt is low across the child's hips and the shoulder belt rests across the center of the child's shoulder and chest.
- Buckle Up: Fasten the vehicle's seat belt buckle.
- Tighten Seat Belt: Pull the shoulder belt to remove any slack, ensuring the car seat and child are securely restrained.
5. Operating Instructions
5.1. 360-Degree Rotation
The 360-degree rotation feature allows for easy placement and removal of your child.
- Engage Rotation: Locate the rotation release lever (usually at the front base of the car seat). Press or pull the lever to unlock the rotation mechanism.
- Rotate Seat: Gently rotate the car seat towards the car door.
- Secure Position: Once the child is in or out, rotate the seat back to its desired travel position (rear-facing or forward-facing) until it clicks securely into place. Ensure the rotation lock is engaged before driving.

This image illustrates the car seat's ability to rotate 360 degrees for convenient entry and exit from both sides.
5.2. Headrest and Harness Adjustment
The headrest and harness system are designed to adjust simultaneously for a perfect fit.
- Adjust Headrest: Locate the headrest adjustment lever (usually at the top back of the headrest). Squeeze the lever and slide the headrest up or down to the desired height.
- Correct Height: The headrest should be adjusted so that the shoulder straps are at or just below your child's shoulders when rear-facing, and at or just above your child's shoulders when forward-facing.
- Automatic Harness: The internal harness straps will automatically adjust their height as you move the headrest, eliminating the need for re-threading.

This image demonstrates the headrest's ability to be adjusted to 10 different height positions to accommodate a growing child.
5.3. Recline Positions
The car seat offers 5 recline positions for your child's comfort.
- Adjust Recline: Locate the recline adjustment lever (usually at the front base of the car seat). Press or pull the lever and tilt the seat to the desired recline angle.
- Secure Position: Release the lever once the desired recline is achieved, ensuring it locks into place.

This image illustrates the car seat's five adjustable positions for sitting and reclining, enhancing child comfort.
5.4. Comfort Inserts
The removable comfort insert and baby wedge are designed for use with newborns and smaller infants. As your child grows, these inserts can be removed to provide more space.
- Baby Wedge: Use for infants from birth to provide proper head and body support.
- Comfort Insert: Provides additional padding and support for smaller children.
- Removal: Remove the inserts when your child no longer needs the extra support or when they become too snug.
6. Maintenance
Regular cleaning and maintenance will prolong the life of your car seat and ensure hygiene.
- Fabric Covers: The fabric covers are removable. Refer to the care label for specific washing instructions. Typically, they can be hand-washed or machine-washed on a gentle cycle with mild detergent. Allow to air dry completely. Do not tumble dry or iron.
- Plastic Parts: Wipe plastic parts with a damp cloth and mild soap. Do not use abrasive cleaners or solvents.
- Harness System: Clean the harness straps with a damp cloth and mild soap. Do not immerse the buckle in water or use lubricants, as this can affect its performance.
- Storage: When not in use, store the car seat in a cool, dry place away from direct sunlight.
7. Troubleshooting
If you encounter any issues with your Osann One360 car seat, refer to the following common problems and solutions:
- Issue: Car seat rotation is difficult or obstructed.
Solution: Ensure the car seat is not positioned too close to the vehicle's backrest or other obstructions. Adjust the ISOFIX connectors to provide sufficient clearance for rotation. Check that the rotation release lever is fully engaged. - Issue: Harness buckles are difficult to connect or frequently slip down.
Solution: Ensure the harness straps are correctly positioned and not twisted. Practice connecting the buckles to ensure proper engagement. If the buckles are consistently slipping, ensure the harness is tightened correctly after placing the child. - Issue: Car seat feels wobbly after installation.
Solution: Recheck the ISOFIX connection to ensure both connectors are securely latched and show green indicators. Verify that the Top Tether is attached and tightened correctly. Push the car seat firmly against the vehicle seat back to remove any remaining slack. - Issue: Headrest or harness adjustment is stiff.
Solution: Ensure the adjustment lever is fully squeezed or pulled. Check for any obstructions or debris in the adjustment mechanism. Do not force the adjustment.
8. Specifications
| Feature | Detail |
|---|---|
| Brand | Osann |
| Model Number | 26201808 |
| Recommended Minimum Weight | 0 Kilograms (with baby wedge) / 9 Kilograms (without baby wedge) |
| Maximum Supported Weight | 36 Kilograms |
| Material | Polyester Blend |
| Special Features | ISOFIX, 360-degree rotation, Adjustable Headrest, Recline Positions |
| Installation Type | ISOFIX with Top Tether, Vehicle 3-point Seat Belt |
| Product Dimensions (L x W x H) | 49 x 49 x 57 cm |
| Item Weight | 8.51 Kilograms |
9. Warranty and Support
For warranty information, product support, or to report any issues, please contact Osann customer service directly. Details can typically be found on the official Osann website or through your retailer.
It is recommended to register your product with Osann to receive important safety updates and warranty service.





