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These waterproof NFC (Near Field Communication) Tags are perfect for making stages of a multicache. Easy to program using free apps and compatible with all NFC enabled Smartphones.
Once programmed you simply touch your phone against the tag to receive information from it, anything from basic text to automatically opening apps on the users phones can be simply programmed.

These tags can also be used for storing emergency information.

Technical details:

Size: Round 32mm, Rectangle 42x26mm
Chip: NTAG213
Storage capacity: 144 bytes
Working frequency: Round tags 13.56MHz, Rectangle tags 14.50MHz 
Erase count: 10,000 times
Data storage: 5 years
Read/write Distance: 1-11mm
Support Agreement: ISO14443

Crystal Card is a very new RFID smart card with dust, waterproof, earthquake-resistant characteristics

1, Crystal drop gum, appearance fashion
2, waterproof and moisture proof, wear-resisting
3, easy to use

Technical parameters:
Material: PVC Epoxy resin (AB glue)

Why not add a sheet of extra small cache stickers to your order to clearly identify the tag as being part of a geocache?