Wmycongcong 8 Pcs Ky-040 360 Degree Rotary Encoder Module With Knob Cap For Product Details Specification: KY-040 Module: Knob Cap: Connection: Package Content: The rotation counts are not limited, designed with continuous 360 degree rotation sensors. Working voltage: 5V Material: Electronic components + PCB Reset to its initial state with the buttons on the rotary encoder, starts counting from 0. Designed with detent and push button switch feature, comes with nuts and washers, suitable for Arduino micro controller use. 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.