RFID waves are sensitive to some type of obstacles like metal, cement, water. They have difficulties in passing through walls or liquid (e.g. human body). GearEye provides special on-metal tags which can be read on metal but within shorter distance than regular ones.
Water, metal or thick walls make it difficult for any radio devices to penetrate through them, including various Bluetooth trackers or Wi-Fi or cellular. GearEye provides special on-metal tags which can be scanned with GearEye RFID Scanner even on metal surfaces, but within shorter reading distance than regular tags have