I got my HV passthrough for my 510 today and I couldn't wait to try it out. My impression, Awesome!!!. This thing kicks my regular (one with a battery)passthrough's ....!!! One prob though, sometimes it works and sometimes it doesn't. I think I have a faulty connection. I found that if I move the wire at the tip where the wire meets the LED CAP, it starts glowing red and starts working again. If I move it the other way it starts flashing green. I will be sending this back for a replacement. Be assured when it is working, it rocks!!!