How do you change batteries in a rumours watch?

To change the battery in a Rumours watch, first, locate the small groove on the back of the case to open it. Use a case opener tool or a flathead screwdriver to gently pry off the back cover. Once open, carefully remove the old battery, noting its orientation, and replace it with a new battery of the same type. Finally, reattach the back cover securely to complete the process.