550 vs 650 DTR questions

[silverbk]

What are the main differences between models? ie 550 vs 650

On the currently made  models what is the difference between the 600 and 700?

I have heard that the 410 is one model to avoid? Why exactly?

[Guest]

Here is the user guide for the DTR 410 / 550 / 650 family

9980384r89-o_dtr_eng.pdf (motorolasolutions.com)

those radios are unlikely to be available as "new" any more.

The current DTRs are the 600 and 700 that play well together and differ as outlined here:

 

[nokones]

The DTR600 is a 30 Channel radio and the DTR700 is a 50 channel radio.

I finally received my DTR700 radio and I was impressed with the performance in distance and the audio quality of the DTR700 radio. I was able to receive an user with a DLR1060 radio about 2 miles away.

Last weekend I was using a remote speaker mic with an earpiece and sometimes a dual-muff boom mic headset with an in-line PT-T switch and they worked perfectly. I am able to use my headsets with both the XTS5000 radios and the DTR700 radios by switching out the adapter cables.

[WRWH978]

I picked up a DTR 650 recently and I'm going over all the features - is there a way to lock the key buttons on the radio? Perhaps I missed it in the manual, couldn't find it.