MagnetoSpeed Sporter Barrel Mounted Ballistic Chronograph

For center-fire rifles and revolvers only, not compatible with airguns or rim-fire. (Note: Not compatible with the Large Brake Adapter or the V3 Rail Adapter.)
MagnetoSpeed Sporter features

Simple, one-button cycling display (shows recent shot velocity and statistics, plug in to turn on)
Battery : 9-Volt (included)
Easy access battery compartment, no need for screwdriver to swap batteries
Three sensitivity settings for fine-tuning
Integral, quick-attach strapping system; with metal buckle and triad thumb nut
Proven technology with updated sensor design
Integral 3.5 foot sensor cord
Kit includes

Display Unit
Bayonet-style sensor (Bayo)
Thick and thin rubber V-block spacers
Heavy duty strap with thumb nut tightener
Ultra-compact storage container