The discount and rules are simple.
Discount and free shipping will auto apply into your order.
The event starts from Nov 24 and ends at the end of Nov 28.

Buy 1: Discount 5% (Free Standard Ship)
Buy 2: Discount 7% (Free Standard Ship)
Buy 3: Discount 10% (Free Fast Ship)
Buy 4: Discount 13% (Free Express Ship)
Buy 5: Discount 15% (Free Express Ship)