The PSU specs and barrel connector dimensions are as follows:
Output: 12 volts DC 1-2 A (1000-2000 mA), center pin of barrel is positive (+)
2.1mm ID, 5.5mm OD
The PSU specs and barrel connector dimensions are as follows:
Output: 12 volts DC 1-2 A (1000-2000 mA), center pin of barrel is positive (+)
2.1mm ID, 5.5mm OD
Yes, it is perfectly fine for any of our devices to remain plugged in and connected to your Mac (or iOS device). There is no harm in the device remaining powered up while you’re not using it.