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1. Power on the device by pressing the power button. 2. To select a sound, press the 'Sound' button until your desired sound is displayed. 3. Adjust the volume using the '+' and '-' buttons. 4. Set the timer by pressing the 'Timer' button and selecting your desired duration (30, 60, or 90 minutes). 5. To use the night light, press the 'Light' button and adjust the brightness using the '+' and '-' buttons. 6. To record your voice, press and hold the 'Record' button for up to 3 minutes. 7. To play the recorded sound, press the 'Play' button.