Comparison : Item # XZTHI78W, 3.2 x 2.4 Millimeter (mm) Size Infrared Emitting Diode
Item # XZTNI45W-2, 3.5 x 2.8 Millimeter (mm) Size Infrared Emitting Diode
Item # XZTNI54W, 2.0 x 1.25 Millimeter (mm) Size Infrared Emitting Diode