Voice Control FunctionThe battery alarm clock has the voice control function, that is when the clock detects the sound over 90 dB, the LED display lights up and you can also light up the digital alarm clock by touching the key ''SNOOZE/LIGHT''. If nosounds or actions, the display goes off in 6 seconds to save energy. Please be noted that when you keep the clock connecting to the power, the sound control function is turned off and the display always turns on 2 Alarms with Snooze Function & Nap TimerThe alarm clock battery powered has dual alarms and you can set 2 alarms in one day to plan your time appropriately. There are 40 ringtones for you to choose and the volume can be also adjusted(8 levels foryou to choose). With the snooze function, you can just touch the Snooze/Light button to get extra 5-60 mintues snooze time. The clock also has a nap timer to give you a 5,15,30,45,60,75 or 90 minutes for a break Week Display & 12/24H & Adjustable BrightnessDifferent from other alarm clocks, it can also show the day of the week. You can choose 12H mode or 24H freely. The brightness of the portable alarm clock can be adjusted in 4 levels manually to meetyour need. During the charging, the LED screen always lights up and automatically adjusts the brightness in 3 levels for different periods USB Charging & Built-in Backup Battery& Low Battery AlertThere is a USB charging cable included for the power supply(No Adapter) to charge the rechargeable bedside clock. A built-in backup battery to save the settings of your recharging clockin the event of a power failure. The low battery indicator light of the travel clock can remind you to charge the clock in time (Attention: Please connect with the USB port or ONLY 5V/1A and 5V/2A adapter to charge the clock) Voice Control Function The clock has the voice control function and when the clock detects the sound over 90 dB, the LED display lights up(You can clap your hands, pat the table or cough to light up the clock) Clock with dual alarms and nap timer There are two alarms for the clock to meet your needs in different time. You can also set 5,15,30,45,60,75 or 90 minutes for a short break. Snooze Function Different from other alarm clocks, there are 5-60 time for the snooze time(you can set the time according to your need), and you can just touch the Snooze/Light button to do it. Memory Function Built in backup battery to save the settings of your recharging clock in the event of a power failure. Very convenient for your life