This is ideal for placing near the door and prompting people to ask for ID or put the chain across. The Memo Minder plays back a pre-recorded message of up to 20 seconds, when motion is detected nearby. It can remind someone who is ill to take medication or leave the chain on the door before opening. This product is also ideal for individuals who remain independent but need gentle reminders. Adjustable wall mounting bracket included. Requires 4 x AA batteries (included).