1.【Snooze Button】-The alarm clock comes with snooze button which you can catch an extra sleep time. 5 minutes later, this digital alarm clock will wake you up again until it was turned off. 2.【Smart Light Sensor】-Automatically dimming based on the brightness of surrounding environment (with the sensor lock "on”) Saving the battery life and longer the working time! 3.【Brightness Setting】-Press the snooze button at the top of this battery alarm clock, the display will light up for 5 seconds. It helps to check the time in dark if its too dim to see. 4.【BATTERY POWERED】-Since it is battery powered you can put it wherever you need it. This product adopts LCD display screen with low current. It is recommended to use 3*AAA carbon battery instead of alkaline battery. 5.【2 Display Formats】-Support 12 or 24 Hours Display & Celsius Fahrenheit Switching.