Low Battery Indicator: The Status LED will turn to red when batteries are low.
Specifications:
Central Wavelength Output Power Spectral Width Transmission Batteries Operating Temp. Detection Distance Dimensions / Weight Light Source Option
650 +/- 10 nm 10mW into Single-mode fiber < 8 nm CW or 2.5 Hz pulse 2 x AAA Alkaline batteries 0 - 50 Degrees Centigrade < 10 Km 13.5 mm X 170 mm / 88 g Class 3B laser diode Adapter Type , ( AC Adapter , DC 3V )