Product description&ltSize: 180 * 46 * 91MM&ltTemperature range: 0 ~ 50 C / 32 ~ 122 F&ltTemperature error range: 2 C&ltHumidity range: 20% ~ 90%&ltHumidity error range: 5%&ltFM: 76.0-108.0 MHz&ltWorking voltage: 5V&ltUSB output interface: 5V 1A&ltDelivery content:&lt1 x Digital FM projection alarm clock&lt1 x USB cable&lt1. 180 ROTATING PROJECTOR & 180 FLIP PROJECTION DISPLAY The projector (-90 to 90 ) can be rotated for projection in your desired direction on the ceiling or wall. Long press the "Projection" button to rotate the projection display 180 . Optimal projection distance of the projection alarm clock 5 m.&lt2. 0-100% ADJUSTABLE DIMMER Digital alarm clock with practical dimmer slider allows the display brightness to be set from 0-100% (dark to light). Ultra-clear, large 8 "LED display is very easy to read and can be seen without glasses. Even ideal for seniors and nearsighted people.&lt3. 2 ALARMS & 5 ALARM TONES & 3 VOLUME & SNOOZE Projection clock can easily be set to two separate alarms so that you and your partner can get up at different times depending on the daily routine.&lt4. FM-RADIO & SLEPP TIMER Radio alarm clocks with projection can store up to 30 FM stations. The 33-inch antenna can be extended for better signal reception. With the sleep timer function, you can fall asleep comfortably while listening to the radio. The radio switches off automatically after the set time (between 5 and 90 minutes) has elapsed.&lt5. USB CONNECTION & STORAGE FUNCTION USB output interface on the back of the digital alarm clock for convenient charging for smartphones. The projection alarm clock is ONLY powered by the standard USB port (USB CHARGING CABLE & ADAPTER included). The built-in CR2032 button cell in the projection clock is used to maintain the time and alarm settings during a power failure. (zhongchengdaye)