Best-mall 3.5" Retro TV Clock Desktop Bedside Lazy Snooze Silent Alarm Clock with Night Light And Thermometer(Blue) Time set: press the TIME SET key for 2 seconds to set the time, month and date, with 12 hours/24 hours system for choice. Alarm set: press the ALARM SET key for 2 seconds to set the time LED night light: long press the LIGHT on the top, the LED light will be ON; and long press LIGHT key again, the LED will be OFF. Thermometer: can be used to automatically measure the temperature (the temperature measurement cycle is 1 minute), with Fahrenheit /Celsius degree for choice Have a 5-minute snooze function. - Powered by 3 * 1.5V AA batteries (not included) or USB cable (included) to connect with DC 5V/500mAh power adapter.