Yolink Smart Home Starter Kit: Water Sensor 4-Pack And Hub Kit - Sensor Product Details Easy to install. Scan, Plug and Play. Full installation and setup in less than 10 minutes Protected and informed, with Realtime phone app notifications, emails, SMS messages and automations (turn on optional sirens, smart plugs..) FAIL/SAFE: Patented technology! Pair your leak sensors to battery powered valve controllers and/or sirens. No internet, no WiFi, power outage no worries! Latest Wireless Technology LoRa: low-power consumption (5+ year battery life) and "Longest Range, by Far!" (1/4 mile, open air) Whole house smart home solution: Your YoLink leak detection system is part of a complete product line, including smart wireless automatic water shut-off and a full smart home solution, including security, locks, plugs switches, temperature, humidity, and smoke/CO sensors, and more Requirements ? Android or iOS smartphone, wired ethernet port or WiFi connection. App is always free, with 5 free texts per device, plus 5, per month. 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.