FX Radar Pocket Wireless Chronograph V2 No light source needed Utilizes Doppler radar technology Detects projectiles at velocities up to 1250 FPS App shows STD deviation, extreme spread, shot strings, etc. App allows multiple rifle profiles Internal 1500 mAh Li-ion battery Rechargeable using USB-C cable Picatinny or bracket mount Weight: 2.5oz Dimensions: 2" x 1.75" x 1.5" Bluetooth capable for Android and iOS app pairing Compatible with FX Digital Chronograph Display (sold separately) Works in all conditions 1-year limited warranty