Hitachi SH-G1000 - Manual (Page 41)

Section 2: Understanding Your Device
33 2A: Your PCS Phone – The Basics
Using the Infrared Communications Port
This device also has an IrDA port for communicating with another
compatible device. When using the IrDA port, position the two devices so
that the respective IrDA ports face each other. In addition, there should be
no obstacles between the two devices.
Be careful that the IrDA ports line up within 15 degrees in the horizontal
and vertical directions and that the distance between the two devices is
less than 70 cm (27.5 inches).
IrDA Port
15 degrees left
15 degrees up
15 degrees down
15 degrees right