X-Sense Smoke Detector Carbon Monoxide Detector Combo, 10-Year, Single Pack Product Details 10-Year Sealed Battery: Contains a long-life lithium battery that powers the device for its entire 10-year life 2-in-1 Protection: This combination detector protects your family against two dangers-both smoke and carbon monoxide Simple Installation: Requires no rewiring; easy to mount this fire and CO alarm on any wall or ceiling with the included mounting bracket, screws and anchor plugs Loud 85 dB Alarm: Upgraded photoelectric and electrochemical sensors significantly increase the sensitivity of the alarm for a faster response time while minimizing false alarms Premium Material: Made from an upgraded PC material that is heat-resistant, high-temperature resistant, and corrosion-resistant Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.