Timer box is used for several inductive loads such as HPS (high pressure sodium) bulbs with high switch on and off simultaneously.
A chargeable battery in the timer allows to run the timer for 36h without power-grid, GSE strictly recommend to keep the battery charged min. once a year. The battery have a restricted warranty of 14 months from the date of the production from GRÄSSLIN. On all other components 24/36months after sales.
The mechanical timer (China) in Timer Box I has a return rate of 4-5%, compared to the mechanical timer (GRÄSSLIN) in TimerBox II & TimerBox III has a return rate of 2% and Timer Box IV with a return rate of less than 0.5%.