AdirPro LED Flashing Prism

AdirPro LED Flashing Prism is easy to change the brightness and frequency of the LED lights by pressing a button on the back of the Prism target. You can select 100%, 70%, 40% and 20% brightness, all according to your best use. You can also change the frequency of flashing to 1hz, 3hz, 6hz and lighthing. The AdirPro LED Prism is a heavy-duty silver-coated prism, 2.5" (62.5mm) in diameter that is contained in a strong plastic canister, making it IP54 water and dust proof. The prism features a large 7" x 7" x 1.96" (178 x 178 x 50mm) target. The prism has a 0 or -30mm offset, and is accurate to 2.5 arcsecond. It has a wide tilt for a larger range of reading. The LED lights operate of 2 AAA batteries and will light up continuosly for 40 hours and blinking for 80 hours on these 2 batteries.