How long does the transmitter (key fob) battery last, and how do I know when to replace it?

The button battery in the transmitter has a lifetime of approximately 2 years, based on 10 locking/unlocking operations per day. When the operation becomes unstable or no longer possible, the battery has likely been consumed and needs replacement. You can replace the battery yourself or consult an authorised Perodua Service Centre. (Page 24)