Overview

The YFFSFDC N2840 is a standalone numeric keypad that connects through a 2.4GHz wireless receiver plugged into a USB-A port. It is aimed at people who want a dedicated number block beside a compact keyboard, or at laptop users whose built-in keyboard leaves them without a numpad for spreadsheets and data entry.
At 149 x 90 x 20 mm it is slim and small enough to slip into a pocket or a document bag, so the design clearly assumes you will carry it around. Power comes from a single AAA battery, which is not included, and there is no charging circuit to think about — you simply swap in a fresh cell when needed.
Beyond the digits, the layout adds Tab, Home, Mail and Delete keys plus a 000 key for entering long figures in one press. Anyone who types numbers all day, whether for bookkeeping, inventory counts or Excel work, gets the most out of a pad like this.

Connectivity & Compatibility

Connection is handled by a dedicated 2.4GHz receiver with a stated range of up to 10 meters. No driver installation is required: plug the receiver into a USB-A port and the pad is recognised. Bluetooth is not supported.
The pad is listed as compatible with Windows, iOS and Android. Note that the packaging may carry a Bluetooth logo even though the device works only over its 2.4GHz receiver, so do not expect it to pair as a Bluetooth peripheral. Because the receiver needs a USB-A port, tablets or phones with only USB-C will require an adapter.

Product Info

Check the retailer's page for the latest price. Rather than replacing a full-size keyboard, it is a low-cost way to add the number block you are missing. The model number is N2840, and both the brand and manufacturer are YFFSFDC. Its slim, travel-friendly body and the practical Tab and 000 keys are what set it apart at this price.

Best Use Cases

  • Laptop users who crunch numbers in spreadsheets: the pad adds digits and a 000 key for one-handed entry, though a USB-A port or adapter is required.
  • People who work on the road or in cafes: the 149 x 90 x 20 mm body fits in a bag and works as soon as the receiver is plugged in, but it is not for Bluetooth-only setups.
  • Anyone who wants to avoid more desk cables: the 2.4GHz link reaches up to 10 meters, so you can add numeric input without routing a wire — not ideal if you insist on a rechargeable device.

Product Disclosure (Amazon)

  • Manufacturer: YFFSFDC
  • Model: N2840
  • ASIN: B0D1VBJLXW
  • Note: This article covers a manufacturer-made product based on Amazon listing details.