SATO MB400 User Manual page 35

IrDA transmission Range
The IrDA allowable distance is 10 to 20 cm.
* Varies from the environment where printer is used. Under direct sunlight or
strong lighting, it may not be possible to make IrDA transmittal. Should this
happen, cover the IrDA filter to interrupt the light, or bring the IrDA filters to
contact together.
PN9001114 Page 35