Projection Function === The alarm clock has a rotating projection function, so it can be projected onto the ceiling or wall (3-5 meters is the best distance). The large red projected numbers are suitable for people with myopia. Multiple Information Display === The temperature clock has functions such as displaying time, date, dual clock, temperature, etc. Displays the temperature in C or F, the range is -9 to +50 degrees Celsius. Two Power Supply Methods === The alarm clock can be powered by 2 AAA batteries (not included) or can be powered by the included data cable. Dual Alarm === A dual alarm function allows you to set two alarms on one clock, one for you and one for your partner. The snooze function allows you to sleep for another 5 minutes before alerting you again. 4 Adjustable Brightness === We offer 4 brightness modes for our customers when powered by DC power - high light - medium light - low light - off, to meet different needs. And the backlight brightness will be in high