LED Temperature Display Electronic Clock Bedside Simple Student Personality Luminous Mute Digital Clock Alarm Clock Date

The product uses 3 7th batteries or USB cable external power supply (external mobile power supply, USB socket, computer, notebook, adapter)

Use the battery, not always on, you can turn on the screen by voice control (when the surrounding sound is 90 decibels or tap the alarm clock, the screen is on for 16 seconds)

Always on when plugged in

All styles are plug-in and equipped with 3 no.7 batteries. (Except for Projection)

All style and time memory functions require 3 no.7 batteries (batteries cannot be removed). Plug-in use, when power failure, powered by battery

All models only contain batteries or only plug-in, and have no time memory function.

All types of batteries can only be on for 12-16 seconds (except those with projection function)

The voice control function of all styles is only effective if the battery is installed (tap the alarm clock or the surrounding volume reaches more than 90 decibels to light the screen)

All styles can be always bright only when plugged in