Has 4 USB,Can use as a USB hub.
Power: USB, power, 3 AAA batteries (not contains).
The backlight of the clock and memo board were always bright when use USB or power.
With battery powered can backlight the clock and message boards about 10 seconds bright, then press the backlight automatically off.Nur the Message board press, Clock and memo boards backlight will be lit again.
Display for TIME,TEMPERATURE.YEAR ,DATE.
12-hour or 24-hour format selectable.
Celsius or Fahrenheit selectable.
Size: about 138*65*116 (mm)/5.4*2.6*4.6in
Color: the color of the backlight in blue, green optional.
Appearance of watch: white
Display screen: LED screen.
USB hub: with 4 USB port hubs.
Power supply: USB charging port or AAA battery ( Batteries not included).
16 types of alarm.
Alarm sound is not very loud.
If Power failure need to re-set.