The 120-10081- 0001 (ET-4000F) from Coherent Corp. is a Photodetector with Wavelength Range 830 nm, Supply Voltage 3 VDC, Rise Time <30 ps, Bandwidth >2.5 GHz, Active Area Diameter 60 µm. More details for 120-10081- 0001 (ET-4000F) can be seen below.