Can you tell me its range? I want to detect my cat's microchip from several inches away, through his skin and fur.

After setting the module to max range, the best I can get is a half inch range. Also, animal microchips operate on a different frequency (~130kHz) than standard NFC 13.56MHz).

Does the rfid-rc522 come with the header pins already soldered?

No. It comes with 2 types of pins; straight and L shaped so you can fit it to any project. But you’ll have to solder the ones that fit to the board

what type of cards should i buy if i want more

the question you ask really makes me stop and think. I believe you are asking about the operating frequency of the card. It needs to have an Operating Frequency 13.56MHz. Many of the ones I see offered from Amazon state that they operate at 125 KHz. I would not buy those. I would buy one that specifies the 13.56 MHz frequency. I prefer the dog tag type over the card type, but that would just be personal preference. I hope my answer is helpful.

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HiLetgo RFID Kit - Mifare RC522 RF IC Card Sensor Module + S50 Blank Card + Key Ring for Arduino Raspberry Pi

Product ID: 28355008

Details

Brand
HiLetgo
CPU Model
Tegra
Connectivity Technology
LAN
Included Components
RFID Kit
Model Name
HiLetgo RFID

⚡Ultra-low power consumption

📡13.56MHz high-frequency RFID

🔒Fast CRYPTO1 encryption

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HK$85

Duties & taxes included

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Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔑 Unlock innovation with the HiLetgo RFID Kit — where security meets simplicity!

PLUG PLAY SPI INTERFACE - Effortlessly integrate with Arduino or Raspberry Pi for streamlined prototyping and development.
ROBUST CRYPTO 1 ENCRYPTION - Keep your projects future-proof with advanced two-way encrypted data transmission up to 424kbit/s.
COMPACT ENERGY EFFICIENT DESIGN - Operate reliably between -20°C to 80°C with minimal power draw—perfect for portable and embedded systems.
SEAMLESS 13 56 M HZ CONTACTLESS COMMUNICATION - Experience lightning-fast, secure data exchange with industry-standard RFID frequency.
COMPLETE RFID KIT WITH BLANK CARD KEY RING - Jumpstart your smart access or IoT projects with all essentials included—no extra purchases needed.

The HiLetgo RFID Kit features the Philips MFRC522 chip enabling 13.56MHz contactless communication with MIFARE cards. Designed for Arduino and Raspberry Pi, it offers secure CRYPTO1 encryption, SPI interface for easy integration, and ultra-low power consumption. The kit includes a blank S50 card and key ring, making it ideal for developing smart access control and IoT applications.

Specifications

ASIN	B01CSTW0IA
Best Sellers Rank	#561 in Single Board Computers (Computers & Accessories)
Brand	HiLetgo
Built-In Media	RFID Kit
CPU Model	Tegra
Compatible Devices	Arduino, Raspberry Pi
Connectivity Technology	LAN
Customer Reviews	4.5 4.5 out of 5 stars (211)
Manufacturer	HiLetgo
Mfr Part Number	3-01-0490-A
Model Name	HiLetgo RFID
Operating System	Linux
Processor Brand	NVIDIA
Processor Count	1
Total Usb Ports	1
Wireless Compability	Radio Frequency

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