Office Chair Extension Board

Currently, no product directly named 'Office Chair Extension Board' has been found, but the expansion of office space can be indirectly achieved through desk extension boards or keyboard tray accessories. Here are specific product categories and their functional descriptions:

I. Desk Extension Boards
These products primarily focus on expanding desk space, with materials including acrylic and aluminum alloy, and some designs supporting folding or height adjustment.

1. Acrylic Foldable Extension Board: Priced at approximately 69.4 yuan, it features transparent acrylic material and a foldable design for easy storage, suitable for widening computer desks or expanding temporary office spaces. It has moderate load-bearing capacity, suitable for placing lightweight devices such as keyboards and mice.
2. Punch-Free Keyboard Tray Side Extension Board: Priced at approximately 80.1 yuan, it is fixed to the edge of the desk with clips or suction cups, eliminating the need for drilling. Some models come with wrist rests to alleviate wrist fatigue from prolonged typing while expanding the horizontal desk space.
3. Aluminum Alloy Adjustable Keyboard and Armrest Extension Rack: Priced at approximately 125 yuan, it features an aluminum alloy frame and supports height adjustment to match different seat heights. Its extended part can simultaneously support the keyboard and arms, suitable for users who need precise adjustment of their office posture.

II. Functional Extension Accessories
These products are mainly modular in design, emphasizing multi-scenario applicability, with some models enabling quick installation through magnetic or punch-free structures.

1. Computer Desk Extension Board (with Keyboard and Wrist Rest): Priced at approximately 19 yuan, it integrates keyboard and wrist rest functions and features a punch-free design suitable for most flat desks. Its extended part can protrude 10-15 centimeters forward, providing independent operating space for the keyboard and mouse.
2. Magnetic Punch-Free Countertop Extension Board: Priced at approximately 21.85 yuan, it is fixed with magnets or silicone suction cups, suitable for non-office scenarios such as kitchens and bathrooms, but some users have modified it for widening office desks. Its material is mostly waterproof plastic, with weak load-bearing capacity, suitable only for placing light items such as stationery.

III. Other Related Products
Some office desk and chair combinations achieve extension functions through overall design, but do not explicitly mention 'extension board' details. For example, a four-person employee desk (priced at approximately 378.1 yuan) may expand its desk length through modular assembly, but requires specific chair models for use.

Purchase Recommendations:
If direct expansion of the space around the office chair is needed, the Aluminum Alloy Adjustable Keyboard and Armrest Extension Rack can be prioritized for its adjustable function to fit different chair heights; if desk expansion is the main focus, the Acrylic Foldable Extension Board offers advantages in transparency and portability. Note that some products are labeled as 'chair-linked expansion', and it is necessary to confirm whether they support direct connection to the seat structure.