Class IIIR laser product, <5mW power output.. 2 AAA Batteries provide 40 hrs of continuous operation Central Wavelength 650 +/- 10 nm Output Power 1mW into Single-mode fiber Spectral Width < 10 nm Transmission CW or 2.5 Hz pulse Batteries 2 x AAA Alkaline batteries Operating Temp. 0 - 50 ? Detection Distance < 4 Miles Dimension / Weight 13.5 mm X 170 mm / 88 g Light Source Class 3A laser diode