I picked up one of these units. They messed up my delivery address and UPS almost didn't deliver the package. There were no instructions provided with it. TDR takes some time to learn how to read. I've found the wiring test is very flakey. It will say a miswire (all wires show "cut") but the cable tests fine in another tester. PoE and CDP works which is nice. Battery seems to hold a long charge (I haven't charged it yet and used it quite a bit).