1.The 2 shot clocks are wireless synchronized with scoreboard The 24s of scoreboard will start timing when game starts, at the same time, the 24s shot clocks will start timing automatically. 2.There will be loud sound when countdown to 00 second 3.You can also control the scoreboard and 24s clock separately by remote control. 4.Valid Control distance: UP to 50m 360°---no angle restriction