XC Tracer Mini is an acoustic variometer powered by a solar cell. The lag-free indication of lift / sink makes it much easier to find and core thermals than when using a conventional variometer.
XC Tracer Mini has a built-in solar cell that delivers 3x more energy than is needed for running the device (when oriented perpendicular to the sun). The surplus energy is stored in a lithium polymer battery. The variometer will run for 8-12 hours with a fully charged battery without any sun, depending on the sound level.