I have been here for a long time and have learned a lot. Thank you everyone for sharing! We are willing to provide 10 foil assist units at a 40% discount to everyone to help promote it. We have tested the product and found that the thrust is greater than 30 kilograms and the battery life is greater than 3 hours. Welcome to provide good suggestions to make our products better. Coupon code YM565ZM5 www.yefoil.com . Only 10 units have this offer. After 10 units are sold, there will always be a 10% discount.