This kit includes all required parts to use a VT-01 (Class 2) transponder module with an AIR Control Display (ACD-57).
What is the difference between Class 1 and Class 2:
Class 1 transponders are more powerful and increase your visibility to ground radar stations during long flights at higher altitudes (15,000ft+). For most glider pilots, a Class 2 transponder is sufficient and uses less battery power.
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