[AC Adapter & Battery Backup] Plug the projection clock into a wall outlet with the included power adapter to keep the clock working and the display lit. Battery backup can keep the time settings. When the clock is only powered by batteries (requires 2 AAA batteries, not included), the screen will not stay lit and projection will shut off. [Dual Alarms & Snooze] With separate switches on the back to control two alarms for different schedules and plans. The additional snooze function allows you to sleep for 5 minutes after the alarm rings, at a simple press of the SNZ/LIGHT button at the top. [Large LCD Screen & 4-Level Brightness] Comes with a large colorful backlit LCD screen, this projection alarm clock displays time, temperature, humidity clearly. 4 brightness settings (HIGH/MEDIUM/LOW/OFF) provide an optimal vision that suits you best for maximum comfort in different time or environment. [Wireless Remote Sensor] Capable of connecting with wireless remote sensors, the projection clock registers outdoor temperature and humidity readings around your living area. Please follow the guidelines in the manual to learn how to connect the sensor with the alarm clock and a few tips about its placement. [180° Projection & Adjustable Focus] The projection alarm clocks for bedrooms fits right in on your nightstand to project time and temperature onto the ceiling or wall. You can either swing the projector or flip the projection for 180° to easily tell the time and temp. The focus knob on the back allows you adjust projector focus to obtain clearer projected readings.