Both the S4.4 and the S4.10 are supplied with the Trantec LP2 lapel microphone as standard, but you can also choose alternatives from a selection of head-worn and collar-worn microphones to substitute for the lapel/tie-clip microphone.
These are the well established replacements for the earlier S4.4 and S4.16. The S4.4 is available in Channel 70 (863-865MHz) whilst the S4.16 is available in both Channel 70 and Channel 38 (606-614MHz)