Yes, yes, and yes. It can easily be done.
Your Saphe traffic alarm can be paired with as many phones as you see fit, and your phone can be paired with as many Saphe traffic alarms as it has memory capacity to handle.
One traffic alarm and one telephone may be connected at the same time
Although you can pair multiple devices, one phone can only be connected to one traffic alarm at a time, and one traffic alarm can only be connected to one phone at a time.