Nevir NVR-7700-32HD-N2 Operating Instruction page 51

Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type.
Batteries shall not be exposed to excessive heat such as sunshine, fire or the
like.
Used batteries should not be thrown into the garbage can, please leave them
at an appropriate depot.
Where the MAINS plug or an appliance coupler is used as the disconnect
device, the disconnect device shall remain readily operable.
These servicing instructions are for use by qualified service personnel only.
To reduce the risk of electric shock, do not perform any servicing other than
that contained in the operating instructions unless you are qualified to do so.
Attention:
Motionless picture might cause permanent destruction to the display.
Be sure not to display motionless picture on the LED TV for more than
2 hours, because it would cause picture remnants to appear, which is
called "screen burns". To avoid such picture remnants, please decrease
the "contrast" and "brightness" of the display when displaying motionless
picture.
While watching TV program in 4:3 size mode for a long time, there would .
be traces on the edge of the screen's left, right and center parts because
of different transmition of the light on the screen.Similar impact on the
screen will occur when playing DVD or connecting games control. Products
destroyed by these reasons can't be guaranteed for maintenance.
It might cause picture remnants to display electronic games and motionless .
picture of PC more than a period of time.To avoid such effect, please
decrease the "contrast" and "brightness" when displaying motionless
picture.
CAUTION
CAUTION
CAUTION