There is only one manufacturer who currently does this that I know of and folks I have to say this was a brilliant idea. You get a call from a customer that the lights are out. Direct them to a trans box and ask them to look for indicator lights. Troubleshooting over the phone. If it's power loss they reset a GFI or re-plug in the unit. if it's a low voltage issue have them re-set a breaker supposing no short or overload. Other problem then you schedule a service call. Geniuses. I'll take LED's over a service meter hands down.