I've bought several of these and they work well. They do have a tendency to have the wire pull out of the case and the plug. If you buy one, put a little bit of Gorilla Glue around the wire where it enters the case and the plug. When it dries, color the glue with a black magic marker and then the wire will not pull out of the case or plug. The last one I bought had the voltage regulator set a little bit high, about 9.2 volts instead of 8.4. That sounds like a good thing because the extra volt will give the radio an extra bit of power, but that extra volt can overheat the output power transistor, and if you get long winded, it can shorten the life of the transmitter. However, they do work well and I would buy this item again. Well, I did buy this item again. I now have 3 of them.