The C12702-03 from Hamamatsu Photonics is a Photodetector with Wavelength Range 400 to 1000 nm, Supply Voltage 4.75 to 5.25 V, Bandwidth 4 kHz to 100 MHz, Active Area Diameter 1 mm (Photosensitive), Responsivity/Photosensitivity 0.5 A/W. More details for C12702-03 can be seen below.