1. Nd-Fe-B magnets for magnetic source of reliable magnetic properties;  
2. In the depths of non-magnetic materials can absorb up 0.1-35Kg iron;  
3. Core guaranteed 10 years under normal circumstances never less than 4% demagnetization ;
4. Artificial regularly dumping iron, and is of small size, light weight, easy installation features;  
5. JB/T8711-1998 various technical indexes meet the standard.