Hi are these tags compatible with the HID 5321 and 5421 readers?

Hi Sorry,we don't Sell HID Cards and tags.Thanks for your inquiry.

What is the effective distance? Are these like nfc tags where you need to be within a few centimeters?

Hi Scottyes,the reading distance normally is less than 5cm.need to close to the tags,but no need to touch.Thanks.

I need to put the tag inside the battery of laptop for inventory. It will work? Or do you have other model for that purpose? Thanks

If you want to put on laptop. need to use the anti-metal tag: see below: https://www.amazon.com/dp/B01FR6M8SS NFC Tag anti-metal: https://www.amazon.com/dp/B07C1W2R7M Thanks.

Does this work with an iPhone app of some kind?

Depending on the RFID scanner you have (which you need to have separately) and to what automated system that is connected to. These are just the id stickers

ASIN	B01LZYOR7P
Best Sellers Rank	#142,445 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #88 in Commercial Access Cards
Color	Diameter 25mm
Customer Reviews	4.2 4.2 out of 5 stars (142)
Date First Available	September 28, 2016
Is Discontinued By Manufacturer	No
Item Weight	0.704 ounces
Item model number	M1SD25-50
Manufacturer	YARONG
Other display features	Wireless
Package Dimensions	3.07 x 2.17 x 0.43 inches

RFID Sticker tag 13.56mhz Round 25mm Adhesive Back -50pcs

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