4 x 3.56mm, Lens Shape: Dome, LED Material: AlGaAs, Maximum Supply Voltage: 2.Wurth Elektronik 15435385A9050, WL-SIMW 855nm IR LED, 3535 SMD package, Radiant Flux: 800mW, Radiant Intensity: 350mW/sr, Mounting Type: Surface Mount, Number of Pins: 2, Dimensions: 3.4 x 2.