... alarm sound when time is less than 24 sec 3.Easy to carry Introduction: TF-BK2007 basketball ... it has a special control system and displays 24 sec attacking time before the spectator. It brings ... consumption, long lifespan.3. It can display playing time of each section and 24 sec countdown time.4 ... a area of 1,500 square meters., competitive price.3. Integrated department from sales, purchasing, R& D, ...