This is a set of a wireless call system and an SOS button. It's convenient for caregiving and emergency calls. It appears to be used in conjunction with a smartphone app. [Set Contents] ・Wireless call system main unit ・SOS button (wristwatch type) ・SOS button (pendant type) This is a used item, but everything was opened for setup, the setup was performed, and then it was put away. Therefore, please understand that there may be dust and small debris. Please refrain from purchasing if you are sensitive to such things, as it has been stored at home. Thank you.