BestCare Intl' guarantees your satisfaction with the merchandise you purchase from us. If you are dissatisfied with your purchase, you may return it to us within 15 days of the purchase for refund. Please contact our customer service at info@spo2.info or call 1.888.900.3585 for a Return Material Authorization Number (RMA#) and for further assistance. To expedite the processing of your return, please reference your order number and the RMA number.Thank you.