Players, coaches, referees and fans will know how much time remains for the offense to attempt a shot with the Wireless Basketball Shot Clocks. Dimensions: 20"H x 15"W x 7"D - 12 lbs. ea. The shot clocks' large LEDs display how much time is left for the offense in bright red numbers, while the timers above display the time remaining in the period. 8” LED shot clock digits (300' viewing distance) 4. 7” game clock digits Power supplied by built-in rechargeable batteries or 110v AC power cord Built in horns