This is a used item. It's being sold because it's no longer needed. It was able to connect with a smartphone using the current app. The sensors and base station operation have been confirmed. A discount is available if you purchase it as a set with a camera from the same company, which I am also selling separately. It's convenient because you can manage them with the same app. Contents (all in the first photo): * Sensor * Base station * Base station cable and adapter I've attached photos showing the sensor attached to a doll and confirming its operation with the smartphone app. The base station is also connected. Although I haven't attached photos of the alerts sounding, I have confirmed that both the smartphone and base station also function with decreased body movement and prone positions. Please refer to the following URL for a comparison with the current model: https://www.kankitsukei.com/babymonitor3-sense-u/ When shipping, the packaging box will be folded to make it as compact as possible. Please understand. For other usage instructions, please refer to the following page: https://shop.sense-u.com/ja-jp/pages/user-manual-baby2?srsltid=AfmBOooevl-iNS0M0CBmiBc_l0ybMbZtzp36WWqYmPIlwqQS-2xpRdnx Thank you for looking.