Sa is right on. Actually the switch on the buddy box is left off for Futaba and Airtronics brands. The JR buddy boxes are an exception because they need to be powered by theiri own batterys. Our club uses Saturday and Sunday until noon for training new flyers. Others can fly at the same time(at their own risk!). The morning is better because the winds are usually pretty calm. Past noon, you need planes with lots of power and sport wings on them.