While you can't connect 2 phones to the same unit AT THE SAME TIME (this is a limitation of bluetooth technology), you CAN connect multiple units (up to 4) using the same phone. So if you get a notifications, all 4 connected units will blink (if they are all in range).
The alarm mode will have a slow fade to brightness. The light will slowly fade on for about 5 mins before the alarm due time. The fade on duration is not adjustable at this moment, though we may work on this and update for future generations of the app