Specifications: Name: LED Digital Wall Clock Material: Plastic Power Type: External Power Supply (USB Power Supply) USB Cable Length: 200cm/78.74inch Package Size: 22*12*4cm/8.7*4.7*1.6inch Product Size: 21.5*11*3cm/8.5*4.3*1.1inch Function: 1. time/date/temperature/week display 2. dual alarm function Support to set alarm frequency: 1-5/1-6/1-7 1-5: Alarm rings from Monday to Friday 1-6: Alarm rings from Monday to Saturday 1-7: Alarm rings from Monday to Sunday 3. Brightness adjustment 5 levels manual brightness adjustment and auto-sensing 4. Time memory function Available when used by battery and plug at the same time Function 7. 12/24 hour format switch (1) Time display (2) Press set button more than 3s 24hr display (3) Press "+/-" button can switch to 12hr 8. & 8451;/rv switching Press "-" button more than 3s to switch & 8451;/rys Package Includes: 1 X Digital Alarm Clock 1 X 200cm USB Cable 2 X Non-Marking Nail 1 X Instruction Note 1: take off the protective film on the clock screen, it will be brighter. Note 2: it will go off after 10 seconds if only with 3xAAA battery (not included). Clap your hand or knock on the table over 60dB to wake up the screen. If you want the screen always on, please plug it in. (USB cable included but plug not included)