aliexpress new invention in china GYM voice prompt timer 1,voice prompt timer clock 2,CE,RoHS 3,training/rest ... *16*4.5cm Product DetailsParameter:1,led clock size: 71*16*4.5cm2,character of led clock : 6digits 4inch3,led clock Frame: Aluminum alloy4 ... to last three seconds for prepare, then start countdown.6. LED display brightness adjustable7. Operation circumstance: -30 ~65 ; 0~95% relative ...