Model Number: VS-HC400-W (Wireless Door Camera: VS-DC400 Monitor Unit: VS-HM400-W) Purchased and used in October 2020. After replacing the batteries in the wireless door camera, the lamp no longer lights up even when the power slide switch of the wireless unit is turned ON. The monitor unit also displays "Out of radio range. Please check the door camera battery level." Since the door camera cannot connect, it cannot be initialized. Therefore, it is being sold as a junk item. Please note that the door camera batteries are not included. The serial number starts with 9L. For those who don't mind, thank you. Door Monitor