Slumbering Additional Troubleshooting MAINTENANCE The clock radio has & built-in timer device called the SLUMBER, which gentiles the radio to be automatically switched off after a set period of time; this allows vou to lie back, listen and fall asleep. The maximum stumbler time is 59 minutes. SLUMBER ON ] 1. Set the RADIO switch to the OFF petition. 2. Set your slumber time by pressing on the SLUMBER button, Keep your finger on the button and the display will begin to count down from: 59 to 00 minutes. 3.