English9INSTALLATION AND EXTERNAL CONNECTIONPRECAUTIONS ON INSTALLATIONIf installing on a metal wallIf you install the reader on a metal wall, the read range may be reduced.To avoid this problem, it is recommended to insert the spacer between the metal wall and the reader as shown below.If installing more than one reader side by side or front and backIf you install more than one reader side by side or front and back, the read range may be reduced. In this case, ifyou present a card to one reader, the other reader may recognize the same card, meaning two readers read thesame card simultaneously.To avoid this problem, keep at least 20 cm of space between the two readers.#Reader 2#Reader 1Minimum20cm#Reader 1#Reader 2Minimum20cmMetalWallSpacerReader