BT4S.US reserves the right to refuse any returns at any time. Due to human error if your product is defective, you can request an exchange. Exchanges are subject to our discretion. No products will be considered for exchange if tampered with in any way. For exchange services, email us at firstname.lastname@example.org within 14 days of receiving your order. Please allow 48 hours for a response. We respond to emails in the order received. Sending multiple emails will automatically put you at the end of the queue.