HIMS International Corporation V400Q User Manual

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It is power switch to the right of front panel of Voice Sense QWERTY. 
This power switch will turn the unit on and turn the unit off. When you 
turn on and off power, push the power switch more than 1 second. 
To turn on the unit, push the switch to the right. To turn off the unit, push 
the switch to the left. 
 

 
It is very useful to know what the remaining battery power when the 
Voice Sense QWERTY is being operated only on battery power.    If the 
remaining battery power is not sufficient, the Voice Sense QWERTY will 
indicate that the battery power is low. In this case, you need to check the 
remaining battery power, especially when you are using the Voice Sense 
QWERTY without plugging it into an AC power supply. 
 
To check the battery power status, press “Fn-b”. You will find the 
following 2 items: 
1.  Battery power level 
2.    Power source (battery or AC supply) 
 
The battery power level represents the percentage of the remaining 
battery power. The power source indicates whether power is coming 
from the battery or the AC power supply. If the battery power level drops 
under 15 percent, the Voice Sense QWERTY will display the battery 
status on the LCD, and it will announce (through the speakers) that the 
battery has less than 15 percent of its power left. If the battery power 
level falls below five percent, the Voice Sense QWERTY will give you a 
warning indicating that your battery power level is under five percent, 
and the Voice Sense QWERTY will be automatically turned off in one 
minute, unless you connect the Voice Sense QWERTY to an AC power