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SpeedStacks G5 Pro Timer is the latest timer of the StackMat TimerSpeedStacks. There are quite a few changes from the previous version. It comes with two operation modes: 4-Pad for stacking and 2-Pad for speedcubing. Just hold the RESET button for 5 seconds to switch modes. RESET and POWER buttons have a new design. Hold-feature on RESET and POWER buttons prevents lost times when the mode is changed.