BOYI TD21 Hot Swappable 21-Key Numpad - Portable Programmable Pad

In this review the BOYI TD21 proves itself as a focused utility keypad for users who need a compact, programmable numeric pad. The main reason to buy is its combination of a true 21-key layout with hot-swappable switches and three-mode connectivity, which makes it useful for gamers, data entry, and anyone who wants a small, customizable input device. The review covers build, connectivity, customization and real-world use to help decide if this mini numpad fits specific workflows.

Key Features

• 21 keys: A full set of numeric and function keys in a compact 21-key PCB gives access to common numpad tasks while saving desk space.
• Hot-swappable switches: The Gateron Yellow hot-swap support allows users to swap 3-pin or 5-pin mechanical switches without soldering for custom feel.
• Three connectivity modes: Bluetooth 5.0, 2.4GHz dongle and wired Type-C let you pair up to two devices and fall back to wired NKRO when batteries run out.
• PBT keycaps: Durable PBT keycaps resist shine and keep legends clear over long use, which suits heavy data entry sessions.
• RGB backlight: Multiple RGB effects and adjustable brightness let users match lighting to a keyboard or gaming rig.
• Software customization: Driver support and remapping options let you reassign keys and build lighting presets to suit workflows.

Who It's For

The BOYI TD21 is best for people who need a compact numeric keypad that is highly customizable: gamers who want dedicated macros, programmers or accountants who prefer a small dedicated pad, and mobile workers who switch between devices. Its hot-swap capability and PBT keycaps will appeal to mechanical keyboard enthusiasts who like to tune switch feel and longevity.

It is less suitable for someone who needs a full-size keyboard replacement or a numpad with integrated palm rest and extra media controls. If you require a built-in rechargeable battery life spec or a full keyset beyond 21 keys, another product may fit those needs better.

Pros & Cons

Pros

• Hot-swappable Gateron Yellow support makes switch customization simple and solder-free.
• Flexible connectivity with Bluetooth 5.0, 2.4GHz dongle and wired Type-C covers most use scenarios.
• PBT keycaps and a sturdy 21-key PCB offer durability and a premium feel for heavy use.
• Software remapping and RGB presets provide practical customization options.

Cons

• With only 21 keys the pad is compact but lacks extra dedicated media or macro keys beyond the core layout.
• Package details imply extra switches may be included but battery capacity and exact runtime are not specified in the listing.

Specifications

Our Verdict

The BOYI TD21 is a well-rounded mini numpad that offers strong value for users who want portability, customization and durable materials. Its hot-swappable design and multi-mode connectivity make it a smart choice for mechanical keyboard fans and professionals who need a small dedicated numeric pad. It is a compact, adaptable tool if you can work within a 21-key layout and do not require extended integrated controls.

Frequently Asked Questions

Can I replace the switches?
Yes, the TD21 supports hot-swappable switches and is compatible with most 3-pin and 5-pin mechanical switches without soldering.

How do I connect multiple devices?
The keypad supports Bluetooth 5.0 and a 2.4GHz dongle and can connect up to two devices; a wired Type-C connection is available for plug-and-play use.

Are the keycaps durable?
Yes, the keycaps are high-quality PBT which resists shine and maintains color and texture over time.