Won the American high-tech crib "BEST OF BABY TECH AWARDS 2017" winner. You can install a dedicated app, but you can also use it without the app. Confirmed operation. Please check the website of the product itself for usage instructions and precautions. Will include 2 swaddles of each size (S/M/L), 2 Sleepnea Swaddles, and 1 crib sheet. The box is originally dirty because it was shipped from the UK. Please purchase only those who understand second-hand goods. About voltage (from homepage) SNOO's voltage input is 100-240V ~ 50/60Hz 1.8A and the output is 12.0V - 4.0A The wattage is no more than a standard light bulb. It works in Japan.We used with twin babies and both started sleeping through the night at 3 months old! The Snoo was great at keeping them asleep and rocking them back to sleep.