ToolBox -

Setting Channel: You select the channel by pressing the  up/down key(s). The lock icon must be deactivated before you can change channels.

Setting Sub Channel: You select the sub channel by pressing the mode button once. The CTCSS display will begin to flash. You can now select the sub channel by pressing the up/down key(s). The lock icon must be deactivated before you can change channels.

How do I deactivate the lock? To lock/unlock the unit press and hold the mode button for 2 seconds.

NOTE: Matching the sub-channel on the transmitter and receiver is important. The system will not work properly if ONLY the channels are matched.