A: Hi, Madonna! Regarding your question about the eufy Security by Anker Add-On Entry Sensor: eufy has the option of $0 per month with self-monitoring. However, for cloud video storage (the ability to watch events that have already happened) there is a cost for that. If you have any further questions, please don't hesitate to contact MyTGTtech at 877-698-4883 every day, between 7am-11pm CST.