Powered by 2 AAA batteries (not included) or charging cable (not included). Digital color screen and LED backlight. Temperature and humidity display. The temperature can be displayed in Celsius or Fahrenheit. Temperature display range: 0-50/32-122. Humidity display range: 20%-99% relative humidity. Projection is fashionable and gives a futuristic feel. Projects the time onto any wall or ceiling. When the projection clock is 2 meters away from the receiving wall or ceiling, the projected font height is about 20 cm; The projection distance is about 1.5m, the projection can rotate the angle is 180.