How do I replace the batteries in the Rth5160D1003?

Install fresh batteries immediately when the low battery icon appears on the screen, which will show approximately two months before the batteries are fully depleted. Even if the low battery icon has not appeared, replace batteries once a year or before leaving home for more than a month. If batteries are inserted within two minutes of removal, you will not need to reset the time and day, as all other settings are permanently stored in memory. (Page 2)