The Large Display Digital Wall Clock has contrast clear jumbo digits (4.3-inch height and green) , which are clear and eye-catching, and can clearly see the time at a distance of 10 meters. The time is accurate and It is friendly to the elderly and children. 4 Adjustable Brightness, the digital wall clock can adjust the brightness of the digits automatically/manually, there are 4 brightnesses to meet different needs, L-SL is ATUO dimming, adjust the brightness according to the time; L-01, L-02 , L-03, OFF is four different brightness, the brightness can be adjusted down at night, which does not affect rest and sleep, and the brightness can be adjusted up during the day, which can easy to read. Multifunctional Large Display Digital Wall Clock with 37.5inch long usb cable, including time, date, humidity, temperature, alarm clock functions, multi-directional monitoring of time, temperature, humidity, and play a certain role in monitoring your living environment , only one alarm can be set, it is not the main function. As you know, LED displays are power-hungry. If you only use batteries for power, you need to replace the batteries frequently, so we use USB cable instead of batteries. On hand, it can reduce battery usage and protect the environment, on the other hand , through the usb cable, you can plug it into the adapter, the power bank or the computer, which is very convenient. The wall-mounted digital clock is very quiet and will not cause noise to affect study and rest, and so it is a good choice for hanging in classrooms, libraries and offices. At the same time, it is very light, only about 550g, which can be easily hung and not easy to fall off. It has hidden stands so it can be placed on a bedside table or desk. color:Black shell green word Material:ABS size:36 x 16 x 4cm Package Contents:1 x Alarm clock 1 x USB cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.