Sony Dream Machine Digital Dual Alarm Clock w/Radio Black ICF-C740 Tested Works

Sony Dream Machine Digital Dual Alarm Clock w/Radio in Black. Model ICF-C740 Full tested (power, dimmer- bright low/high function, single/dual alarm, time setting, snooze, all buttons and switches plus the radio) all in great working condition. However, the back-up function using a 9V battery does not appear to be working, I couldn't get it to work after testing with a new battery (not included). Original battery door cover included. Minor scuffing on plastic and the display screen from age but no chips or dings to clock.