▁shows ▁t enth s ▁of ▁a ▁second ▁past ▁five ▁seconds ▁left ▁on ▁the ▁shot ▁clock . ▁Many ▁college ▁and ▁even ▁some ▁high - school ▁shot ▁clock s ▁( in ▁states ▁where ▁a ▁shot - clock ▁rule ▁is ▁in ▁effect ▁for ▁high - school ▁basketball ) ▁now ▁also ▁include ▁a ▁game ▁timer . ▁ ▁Three - s ided ▁game ▁shot ▁clock s ▁became ▁a ▁tr end ▁in ▁the ▁ 1 9 9 0 s , ▁and ▁after ▁a ▁controvers ial ▁series ▁of ▁calls ▁during ▁the ▁ 2 0 0 2 ▁NBA ▁Play offs , ▁the ▁NBA ▁instit uted ▁a ▁new ▁game ▁shot ▁clock ▁rule ▁in ▁ 2 0 0 2 , ▁requiring ▁specific ▁visibility ▁of ▁the ▁game - ▁and ▁shot - clock ▁time ▁for ▁instant - re play ▁purposes . ▁ ▁FI BA ▁installed ▁a ▁similar ▁three - s ided ▁rule ▁in ▁ 2 0 0 4 . ▁ ▁The ▁rule ▁was ▁further ▁changed ▁in ▁ 2 0 0 5 ▁by ▁perm itting ▁a ▁new ▁Dak tr on ics ▁see - through ▁model ▁( one ▁on ▁top ▁of ▁the ▁basket , ▁one ▁on ▁the ▁end ▁of ▁the ▁basket ▁unit ) ▁that ▁has ▁gained ▁popular ity ▁as ▁many ▁O ES ▁and ▁Dak tr on ics ▁ven ues ▁have ▁adopted ▁the ▁system . ▁ ▁Dak tr on ics ▁has ▁introduced ▁a ▁technology ▁called ▁Color Sm art , ▁which ▁denotes ▁the ▁trailing ▁team ' s ▁score ▁numbers ▁with ▁red ▁light ing , ▁while ▁the ▁leading ▁team ▁is ▁in ▁green . ▁However ▁this ▁technology ▁has ▁yet ▁to ▁be