3 brightness adjustment levels: Dark, medium bright, super bright. Adjusts automatically. Temperature in Celsius, Date, Time Display, 12/24 hours system. Can be placed on a table with a stand or wall mounted using a hole. Powered by USB, with a battery backup for memorizing settings. Large digits for easy reading, ideal for living room, office, or hotel. Display: LED Display Time Format: 12/24 Hour Switchable Temperature Format: Celsius Included: Button Battery (Used as memory time, cannot store electricity) USB Charging Port: 5V, 1A Colour: White Material: ABS Package Contents: 1x alarm clock 1x USB cable Only the above package content, other products are not included. Note: Lighting and different displays may cause the color of the item in the picture to differ slightly from the real thing. The measurement allowed error is +/- 1-3cm.