Shoot-The-Target Demonstrate Independence of x and y Motion For Use with All Launchers This photogate-triggered drop box has a unique electromagnet design for a quick release of the target. The projectile hits the target, proving that the projectile accelerates downward at the same rate as the target. Designed for use with Projectile Launchers. Includes: -Drop box and control box -Control cable -High impact plastic target (75 cm x 20 cm) -Photogate head and bracket -AC adapter (9 VDC, 500 mA)