Sealive Multi-function Digital Weather Projection Wake-up Alarm Clock, LED Backlight, Temperature & Humidity & Calendar Display(black) Small and delicate alarm clock, suitable for children next to the bed.Setting the time. Press and hold the mode for 3 seconds to enter the time setting mode. The hour digits are blinking and can be set by pressing UP or Down for setting hours. Use the same way to set minute. Time: 2 modes(12 hours/24 hours) are available Digital Thermometer and show as centigrade or Fahrenheit It projects the time and indoor temperature on the wall or ceiling. Easy to read. You set it for time OR indoor temperature OR you can set it to alternate every few seconds between time and temp.Attention:Pls use ordinary Carbon zinc batteries.Don't use High volume alkaline batteries. Humidity range:20% rh -99% rh;Temperature range:0-50 graus/32 -122 fahrenheit;Supply: 2 x AAA battery (Not Included)/ DC 4.5v input (PC USB port is available);Package Included:1 x Alarm Clock The light is not so bright that it hurt the eyes.The alarm sounds for a certain range and will not wake the other room people.Will not cause noise, affect others to sleep.