Shipping & Returns

What is the difference between the K2 and K5?
Who are these motorcycles suitable for?
What is the battery range, and how long does it take to charge?
Do the bikes come with a warranty?
How do I order a Combo Pack (2 motorcycles)?
How long does shipping take?
Can I change my shipping address after placing an order?
How can I contact customer support?
Do I need to pay for return shipping?
Are there any items that are non-returnable?