Kingbright L-93 IR LED and Phototransistor Spectrally and Mechanically Matched - Kingbright L-934F3BT, A T-1 (3mm) infra red LED that is spectrally and mechanically matched to a complementary IR phototransistor (58-2005).
Kingbright L-934F3BT 3mm IR Emitting LED 940nm