✅ Does what it advertises reliably.

✅ Easy to install (Leads are sufficient and good quality wire)).

Limitations...

❎ Does rely on the existence of a neutral where it is installed.

Most domestic wall switches are a single active and switched active to the fan circuit.

This necessitates you either run a neutral down to the switch or mount the unit in the ceiling where access to a neutral is assured.

❎There is no provision to switch fan off once triggered.

❎The time adjuster is very coarse so it is quite fiddly to adjust to the time you need.

It's convenient not to have to return to the bathroom to switch 'Off' the exhaust fan once it had been switched 'On' & switched 'Off' immediately after that (when the set time from the timer starts to 'kick in').

However, it had been Extremely difficult to Accurately Set Up the Timer for the Required Specific period of time, & having a Wider range of time period options will be better as well.