Reader SMC-RM125: middle-distance reader SMC-R125: long-distance reader 1. long-distance reader is very stable. After long time usage the readerable wonf+t change avoiding maintaining problem. 2. strong antijamming ability 3. The readable range of SMC-RM125 to electronic ear tag is no less than 420mm 4. The readable range of SMC-R125 to electronic ear tag is no less than 650mm