LCD screen writing board writing environment Love the pen Owner to write on the writing directly with the pen Press the remove to clear the writing note; : Please replace a new battery when the button without function is removed How do you replace the built-in battery? Code loss, pull out the battery to replace a new one Clear the lock LCD screen Writing board to read the environment Pull out the writing pen to write on the writing Directly with the pen Press the button on the removal to clear the writing note; : Please replace a new battery when the button without function is removed How do you replace the built-in battery? Screw loss, pull out the battery to replace a new one Clear the lockLCD screen writing board writing environment Love the pen Owner to write on the writing directly with the pen Press the remove to clear the writing note; : Please replace a new battery when the button without function is removed How do you replace the built-in battery? Code loss, pull out the battery to replace a new one Clear the lock LCD screen Writing board to read the environment Pull out the writing pen to write on the writing Directly with the pen Press the button on the removal to clear the writing note; : Please replace a new battery when the button without function is removed How do you replace the built-in battery? Screw loss, pull out the battery to replace a new one Clear the lock