Touchatag tags are standard issue NFC tags that cannot be overwritten, read more
touchatag uses high frequency RFID (Radio Frequent IDentification) operating at 13.56MHz. touchatag uses passive RFID tags and active readers. touchatag is also compatible with Near Field Communication, a standard based on HF RFID and being implemented in more and more mobile phones.
Next to that, touchatag enabled its service to work with 2D barcodes.