Wireless travel alarm clock battery powered: The best choice for a travel alarm clock is battery powered. A battery powered alarm clock requires 3 AAA batteries (not included). Light sensor of desk clock: At this time, the alarm clock will automatically turn on the background dim light effect based on the intensity of external ambient light. If the external ambient light is weak, the background low light will be turned on, otherwise it will not be turned on. Temperature monitor: With a temperature range of 15.8 to 122 degrees Fahrenheit (-9 to 50 degrees Celsius) and a tolerance of+-1.8 degrees Fahrenheit (+-1 degrees Celsius), you can stay informed of temperature conditions at any time. Electric alarm sound: The beep of this clockwork alarm gradually increases, lasting for 60 seconds. Before the alarm clock stops, you can continuously press the top nap button to sleep for an additional 5 minutes. Silent alarm clock: The battery power is very safe, and you don't worry about power outages. The system can be switched between 12 and 24 hours without any ticking sound, allowing you to sleep well. Applicable places: travel, study, office, bedroom, living room Display screen type: LCD Display type: Number Special features: night light, alarm, perpetual calendar, thermometer Size: 14 inches Shell material: plastic Mirror material: coated glass Dial material: plastic