We now offer the flytec sonic variometer for sale in our online store. The sonic is an excellent choice for minimalist pilots looking to keep thing simple. The Flytec sonic vario can be attached to a helmet either, on the side or in back, or can be worn around the neck. It has two auditory modes. In one mode the vario will beep to indicate lift but remain silent in sink. In the other mode the vario will beep to indicate lift and emit a solid tone to indicate sink. This Vario has a fantastic battery life only requiring replacement after 200hrs or so of use.