Bought 5,36 € on November 3, sent on 4 In followed mail, and received on November 12. The start of this detector is simple and fast. Works with 2 AAA batteries, not included. The manual, in English, is clear and accurate. The app for mobile is remarkable :) clean and neat Design, automatic selection of the local language from 70 languages available, indication of the level of the detector batteries, etc. The connection with the wifi box is perfect: I placed the detector in my mailbox, which is 2 floors lower, and it works. It's really convenient to be warned in real time, when parcels are deposited in the mailbox! Very practical also if you want to solve the mystery of packages "delivered" ghosts