Modern Rectangular Black Bamboo Grain Blue Numerical Wooden LED Alarm Clock Calendar Thermometer with Sound Control Novel wooden digital rectangle clock  Numeral LED display light Beautiful decor for your bedroom Round angle of the clock safe for the family who has baby, you needn't worried the sharp angle will hurt your little child You can insert the adapter to play the clock or use the batteries Time, and temperture are displayed, 2 display modes are freely optional, sleep sound control wake-up duntiona and display brightness will be automatically reduces by half from 6:00 inthe evening to 7:00 in the morning, which favors enery convervation The built-in clock has backup power supply, so the clock timing will travel even after the external power supply off, but there kinds of power supply: Transformer 6vDC or 4 x1.5V AAA batteries (not included) Four press keys easy to operate: EXIT key, SET key, UP key and DOWN key Temperature displays unit degree Celsius/degree Fahrenheit which can switched.There are a 12 hours system and a 24-hour system, which can switch between 12 hours and the 24 hours, the 24 hour system is defaulted