Buyers remember: the alarm clock cannot use large-capacity alkaline batteries, please use ordinary carbon batteries, large-capacity batteries are easy to burn the circuit board! Size of the product : 15 x 10.8 x 2.5 cm. Product packaging unit weight: 214g Product Description: When using dry batteries, the display cannot stay on. When the light is off, the display is black and hard to read. The display is always on when the power is on. The time has no memory function and the time must be reset after a power failure. < p>Compared with professional temperature and humidity meters, there are some errors. The weather forecast is for reference only. The screen faces the face and the projection arm rotates towards the rear of the fuselage. The projection font is positive, which means that when the direction of the person's line of sight is the same as the direction of the projection arm, it is positive, and vice versa. Designed with ergonomic thinking in mind. When the projection clock is 2 meters away from the receiving wall or ceiling, the height of the projection font is about 20cm When the projection clock is 6 meters away from the receiving wall or ceiling, the height of the projection font is about 60cm feature: < p>The battery and the power supply cannot be used at the same time, otherwise the alarm clock will be damaged. High capacity batteries will cause alarm discomfort due to excessive voltage. Compared with professional thermometers, there is a certain error, and the weather forecast is for reference only. The time must be reset after a power failure. The screen and projection are always on when powered by a USB power cable. If the battery is used, you need to manually press the light (the screen and the projection will automatically turn off after 5 seconds after the light is turned on. disabled.) < p>Note: Battery and power cannot be used at the same time, otherwise the alarm clock will be damaged. Do not use high capacity batteries such as Nanfu/Dura. When using the power cord to plug in, it may project for a long time. The temperature and humidity display (compared with professional thermometer and hygrometer, there will be some errors. The weather forecast is for reference only. If it bothers you, take it carefully! Temperature and humidity settings. Predict the current weather condition (compared to professional thermometers and hygrometers, there will be errors. The weather forecast is for reference only, if you mind, please take it with caution)