【Multiple Digital Alarm Clock】: It is a perfect LED alarm clock, with time / alarm / temperature / calendar function. With automatic dimmer function which can adjust the brightness according to the surroundings. 【Wall Mounted Hole and Removable Base】: The clock equipped with a wall mount. Hanging on the wall is supported, and with the large 3D LED number display, time is clearly to see at a glance. A removable base is included, so you can put the clock in bedroom, bedside, kitchen, office, home etc. , will be a good decoration. 【3 Levels of Adjustable Brightness】: Bright /Medium/ Dim --3 levels brightness for choosing. The brightness can be set manually or automatically. When the automatic adjustment function is "on", the clock will dimer at night time. 【USB Power Supply And Memory Battery】: With 1.5M USB power cable included, plug it in computer, power bank, wall outlet etc. Powered by Standard AC outlet. The memory battery(Included) will maintain the clock and alarm settings in case of power failure, no need to set the time again when power off. 【Warm Tips】: The led clock need to be plugged in. The built-in button battery couldn't support the digital clock light up. If there is any problem with the watch, please feel free to contact us. We will solve it as soon as possible and make you 100% satisfied.