Differences between Base Unit Gen 1 vs Gen2

I bought a Gen 2 and devicese to swap out my Gen 1 Ring 1 Alarm. Visually the Gen 1 ad Gen 2 base units look similar and possibly are nearly the same. I suppose there may be some changes internally that I am not aware. So my question is regarding the differences if any between Gen 1 and Gen 2. Are there any differences, such as features, software, hardware, battery etc... differences between the two Base units? Reason I ask, since the Gen 2 devices are all back ward compatible i could keep the Gen 1 base and swap out all the Gen 1 devices for Gen 2 devices. Would i be missing out on something? The main reason for not installing the Gen 2 base is I can swap each devices one at a time over a period of days without taking the alram completely down then having to add every devices at the same time.