Jag Precision Chrono is an advanced chronograph that gives you the most exact detailed readings. Popular amongst the Airsoft community, this chrono is capable of calculating your velocity, energy and rate of fire. Compact in size, this chronograph can be taken anywhere. Screen is LCD and is backlit for hard to see places. The Jag Precision X3200 Mk3 is powered by 2 AAA Batteries (not included).