Is telemetry system for use with RC Altimeter #3 PRO logger. With this system you can track altitude of your R/C plane in real time. You can track current altitude, maximum altitude achived in current flight, vario, battery voltage, temperature and number of interferences in real time and it has variometer audio tone for lift and sink. It has also voice announcements for altitude, vario, batery and flight time. Voice timer function integrated for solo F5J, F3K, F3J trennings.