The Q555 has a 4-pin base which means it has independent motor connections which enable a different switching circuit voltage from the voltage powering the time switch.The Q555 comes with a 100 hour battery reserve which is useful should there be a power failure.The day omit feature means you can skip any day of the week if necessary.There is also a manual override button for your convenience.The Q555 is a fit-and-forget time clock. .
100 hour battery reserve
Day omit on operation (stay off on selected days)
24 hour cycle
4-pin base (volt free -independent clock & switch supply)