Far better than mobile phones...
Cheaper - the only cost is the initial purchase and the batteries/rechargeable
batteries. Most use AAA batteries.
Convenient - Select a channel - ( we use channel 5 ... as in MX-5 ) then just press the transmit button and speak.
No dialing numbers etc. You can inform ALL of changes to plans or
ask to stop/slow down if you get caught in traffic.
NOTE: Everyone can hear everything that is
happening on the selected channel.