| Low Nois, low loss, Good performance |
| Safe and reliable, free maintenance, protect the personal safety reliable |
| Campact structure , small size, tightly sealed |
| Moisture proof, fungi proof, salt fog proof, burglary resistant |
| low temperature resistance, suitable for high attitude |
| Convenient instalation, flexible, easy operation |
| Inteligentisation, supervision, and administration of the backgroundcould be realized |