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RuBee (IEEE 1902.1) an alternative to RTLS and RFID, is a packet based wireless technology. It uses low-frequency (HF) 131 kHz radio waves and active transceivers that communicate peer to peer.
RuBee is magnetic, not RF, so it works on steel and in water. It was designed for high security, high human safety, high intrinsic safety, with low EMI, and EMC asset visibility in harsh environments.