Purchased in August 2025, but I accidentally bought a duplicate sensor and didn't use it after confirming its operation (used once). It's a compact sensor, about 10g and the size of a cap, designed not to burden babies. Contents: Baby sensor, gateway, instruction manual, box ■Product Specifications Brand: Comfortum Manufacturer: Tribute Manufacturer Model Number: CU-PS01 Note: For use, a wired internet connection (Wi-Fi routers that don't require installation are not acceptable) and 2.4GHz Wi-Fi are required. Other: Please check the Tribute product introduction site for detailed product features and FAQs. URL: https://comfortum.jp/product/cu-ps01/ The box will be folded for shipping. Thank you.