1.High Precision:The stop target will transmit hit data to the shot timer instantaneously when it is hit by a projectile, which differs from the sound pressure detected by a firearm shot timer. This allows for precise timing without the possibility of sound interference. 2.Intuitive ,When the stop plate is hit, the target face color will change. If the target face color does not change, this indicates that the target has not been hit by a projectile, and the timer will continue timing. This system of color change is very useful for the shooters,ROs and spectators allowing all to know immediately if the target as been hit or not. 3. Mobility:The built in rechargeable, high-capacity battery, makes it convenient to carry and allows its use both indoors and out. 4.Wireless connection within 100M.The shot timer and stop plate are connected wirelessly with a range of 50meters indoor and 100meters outside. allowing the shooting stage to be built in a very short time.