Whilst the Marsh 241D app can be installed on multiple Android phones, the Marsh 241D coder does not allow simultaneous connection of multiple instances of the app. This avoids the possibility of multiple users attempting to change the code or settings at the same time.
To connect to a second Marsh 241D coder it is necessary to disconnect from the first.
The Marsh 241D app can be used to control multiple Marsh 241D coders but can only be connected to a single coder at a given instance.