The QUATTRO audible Altimeteris a further development of the well-known Optima II.
The QUATTRO can be used to set four different setups each with four warning levels for the free phase, ie one more than the Optima II, and the same as the Optima II four different setups with three warning levels for the flight phase.Thus, it is the ideal tool, should one need more warning levels in the freefall phase such as for example Big-Ways.
