This tag compatible with NFC capable phones and tablets, it is Smart Keyfob Tags.
You can do many tasks use this tag, such as set an alarm, turn phone to silent etc.
If you don't know how to use it,please search YouTube to see.
There are many free applications on internet, so you can program very easy.
This NFC tag can't work with following Phone or Tablet:
Samsung Galaxy S4;
Nexus 10 Tablet;
Nokia Lumia 610;
Frequency: 13.56 MHz
ISO standards :ISO 14443A MIFARE Classic® 4K
MIFARE and MIFARE Classic are trademarks of NXP B.V.
1K byte EEPROM memory (768 FREE BYTES availability)
Read Range: 0 - 50 mm
Size: 40mm x 32mm x 4mm
Material: ABS, Waterproof
Write endurance 100,000 cycle
1000 PCS RFID 13.56MHz 14443A MIFARE Classic® 4K Small Smart IC Key Ring Tag Keyfob Token