SD7 is a wireless mobile smart screen which has built-in 4600mAh rechargeable lithium battery. It supports access to EZVIZ video doorphone, doorbells, peepholes, DIY locks, cameras and other  devices, supports real-time preview, video playback, two-way voice calls. It can be wall-mounted, table-placed, and used in scenarios flexible. This product mainly used in apartments, communities, villas, self-built houses.