FX Pocket Chronograph D1 Built-in color display 1/4-turn locking mount Barrel mount, Picatinny mount, 90-degree angled adapter Display shows: current reading, min, average, max, number of shots Sessions shows: shots, min, average, max, extreme spread, standard deviation Display units: FPS, MPS, Joules, Foot-Pounds, Power Factor Optimized for ammo from .177 to .35 No light source needed Utilizes Doppler radar technology Detects projectiles at velocities up to 1250 FPS Works in all conditions Rechargeable using USB-C cable Bluetooth capable for Android and iOS app pairing App allows multiple rifle profiles, shot string analysis, multiple ammo profiles, drop charts, etc.