125kHz Card Technology

The one advantage of 125kHz is that due to the lower power requirements and small amount of data being transmitted, it offers a good read range (of around 10cm or 3.9”) and a short read time, allowing users to present, swipe, or wave their card in the general direction of the reader to get a successful read.

While 125kHz is still commonly used, the widely publicized security flaws are something that require serious consideration.