10pcs/lot HSDL-4251 infrared emission tube photoelectric light-emitting diode 5mm wavelength 870nm angle ±30°
https://www.vogueparade.com/shopping/EN/150412/1/1005003420822763/10pcslot-hsdl-4251-infrared-emission-tube-photoelectric-light-emitting-diode-5mm-wavelength-870nm-angle-30//