Are these block 0 writable?

I purchased the 20 pack, and the ones I received were block 0 writeable. I have had no difficulties writing and rewriting these using Mifare and the ACR122U writer.

Are they compatible with isonas rc-04 ad r-1?

It depend on the working frequency of your device, this card is 13.56MHz writable UID card.

Are these compatible with Android phones?

Yes, if your smart phone support RFID or NFC function.

Do these cards have their ID number printed on each card?

no, this card is 13.6mhz writable blank card, no number inside by default, it can be write into data and this number is changeable.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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LEXI 100pcs Mi-Fare 1K S50 RFID Card, Rewritable UID Smart Card, Premium 13.56MHz PVC Blank Card for Door Access Control, Block 0 Sector

Product ID: 463025620

📡13.56MHz frequency

🔄100,000 rewrites

🔒Unique encrypted ID

Description

🔑 Unlock Your Access Potential!

SWIFT ACCESS - Experience quick reads from up to 10cm (4 inches) away.
SECURITY AT ITS BEST - Each card features a unique encrypted ID for enhanced security.
SEAMLESS COMPATIBILITY - Works flawlessly with all RFID products and door access systems.
ROBUST MEMORY STRUCTURE - 1K Byte memory organized in 16 sectors for efficient data management.
UNLOCK ENDLESS POSSIBILITIES - With over 100,000 rewrites, customize your access like never before!

The Lexi100pcs Mi-Fare 1K S50 RFID Card is a premium rewritable smart card designed for door access control. Operating at a frequency of 13.56MHz, it supports over 100,000 rewrites and is fully compatible with MI-FARE Classic 1K systems. With a robust memory structure and unique encrypted IDs, these cards ensure both flexibility and security in access management.

Specifications

ASIN	B0895Y7S3M
Best Sellers Rank	#137,746 in Computers ( See Top 100 in Computers ) #1,142 in External Memory Card Readers
Item model number	IC
Manufacturer	Lexi
Product Dimensions	8.5 x 5.4 x 0.18 cm; 572 g

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