GARMIN INTERNATIONAL XEROA(R) C2 CHRONOGRAPH In ballistics there is no room for error. The XeroA(R) C2 chronograph is the source you can trust. This device builds on the success of its predecessor with a faster processor that tracks up to 10 shots per second and delivers reliable data instantly. Connect your compatible Garmin smartwatch to control the device, view live session data or send muzzle velocity from the device to the Applied BallisticsA(R) app on your smartwatch or phone to calculate the perfect shot. Switch between multiple firearms on the range, and keep collecting data for that profile with the new resume session feature. Use t Mfg: Garmin International