Speedstacks G5 is the 2021 updated version of their flagship timer. This timer features thumb placement for additional contact. However, it is possible to disable it for speedcubers.

This timer is not compatible with previous mats. You have to buy their specific mat for it to work. If you can change the placement of the timer connectors from your mat, you can attach the timer to your existing mat. QiYi's Mat beads are detachable. So if you have a QiYi Mat, you might be able to get it to work.