Hiletgo 2Pcs Jsn-Sr04T Integrated Ultrasonic Module Distance Measuring Product Details Specification? The basic working principle: Package Included: With a waterproof sealed emitter. This sensor is suitable for outdoor applications such as car reversing sensors, security alarms, industrial inspection, etc. Integrated with wire enclosed waterproof probe, suitable for wet, harsh measurement occasions. Please note that the device is waterproof, but it couldn't work underwater. Working voltage:DC 5V, Static current:5mA, Total current work: 30mA. Working range: 25cm-4M, Working frequency: 40KHZ, Detecting angle: 70 degree. The module has a variety of modes that can be modified manually, suitable for testing and teaching experiments in different occasions. Application: Horizontal distance messurement,Obstacle avoidance, automatic control, Traffic control, Security, industrial control. 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.