Suitable for RFID Writer (black)

Writable and Rewritable: Erasable and rewritable 100,000 times. Suitable for making new and spare tags, please use with 125kHz RFID reader/copier.

You can't add them directly to an RFID lock, they can't be read until you program the chip, it's the original blank chip.

Can only be read and written by 125KHz RFID writers/copiers, cannot be used with ONITY systems. Proxmark3 RDV4 or other devices.

Chip: ATMEL T5577 (compatible with other common 125kHz tags). Non-NFC chip, cannot be used with NFC mobile phones.

Frequency: 125kHz; Sensing distance: 2.5 to 10 cm (1 to 4 inches); Data storage life: 10 years.