Scope of application: ultra-quiet work, will not disturb your sleep, suitable for family bedroom, study and office. Power supply mode: The alarm clock adopts USB cable and dual battery power supply mode (3 AAA batteries need to be purchased separately), and has a power saving mode, which can last longer for a single use. Multi-function: The LED indicator is clear and bright, and it can clearly display the time, date and temperature in the dark, meeting the functions you need. Power saving mode: When using the battery, the screen can be activated by voice, such as clapping and other actions, and it will automatically turn off after 16 seconds. Note: The data are all manually measured, please allow 1-3cm error due to different light and display, there may be differences color, please refer to the actual item received.