Ring Retrofit Alarm Kit: A Wired Security System Must Already Be In Place, And Product Details This product is for customers with functional wired contact sensor zones from an existing security system who wish to make the switch to the Ring Alarm system. The Ring Alarm system (sold separately) is required to enable Retrofit Alarm Kit functionalities. Connect your existing wired contact sensor zones from an existing security system to the Ring Alarm system with Retrofit Alarm Kit. When connected to Retrofit Alarm Kit, doors or windows with existing wired contact sensor zones will function as part of the Ring Alarm system. Receive mobile notifications and arm or disarm your Ring Alarm system from the Ring app. Manage all your Ring Alarm devices, including connected existing wired contact sensor zones, and your Ring doorbells and cameras through the Ring app. Installation by an experienced security system installer or licensed electrician recommended. Get 24/7 emergency services and professional monitoring with an eligible Ring Protect plan. Works with Alexa to arm, disarm, and check the status of your Ring Alarm system. 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.