Once they are on you just can talk to another. You should consider the upgrade to the 2Talks Bluetooth Headsets by My Team Talks. Technology has come a long way!
The headsets only need to be paired once. They will remember their pairing forever (unless you manually delete the pairing). The headsets will reconnect (and/or be reconnected manually or put in standby mode with a press of the center button) when back in range.