Specification Brand : ProIcWorld BulletPoint1 : Delivery time: 7-18 days by special line for USA , 8-25 days by regular post for Worldwide,If it is not received within the specified time, please contact us and we will refund you in full. BulletPoint2 : If you need the product urgently, you can choose expedited service. We will use DHL to serve you. Delivery time: 3-7 days. BulletPoint3 : We are a professional distributor of electronic products.. Just search keywords in our store. BulletPoint4 : Please note that the products are only offered by the brand: GalaxyElec. Other sales people is not reliable. BulletPoint5 : any question,please feel free to contact me. ExternallyAssignedProductIdentifier : 5302611340298 ItemName : 10PCS/LOT RTC Real-time Clock Module DS3231SN ChronoDot V2.0 I2C for Arduino Memory DS3231 Module ItemTypeKeyword : clock-integrated-circuits Manufacturer : ProIcWorld PartNumber : PIWmixui_12034 ProductDescription :