to tell you the truth I dont know either. I didnt really research it enough before I bought it...I'm just an excited newbee who learned the hard way. The funny thing is they offer Joye Tech, DSE, SLB or Keimer for the same price
I have tried and am happy with Joye 510 and DSE 901
have you are anyone tried Tech, SLB or Keimer? I am also curious about the cisco Spec 306 LR