1, The smaller size, portable to carry 2, Easy to operate, USB charging 3, LCD indication, blue LED ... reader known today. In spite of its very small size the reading range is equal or even greater ... FDX-B and FDX-A.FEATURES:The smaller size, portable to carryEasy to operate, USB chargingLCD indication ... Current<20mAPower-down Current<10uAPowerLi-ion, 3.7VDC, 170mAH Mini RFID Animal Reader with USB