It is acrylic frame with two stand,8.5mm thick,screw opening to change poster,the back has a battery box and switch,
you can put AA battery in battery box,very convenient to use.
The standard size is A4 and A3.
A4 frame size :270x357mm
A4 poster size:210x297mm
A3 frame size:357x480mm
A3 poster size:297x420mm
It is good tools to use in restaurant.
