Stable signal: self-built 2.4G Hz wireless WIFI LAN, the doorbell does not need to be connected to the router WIFI Low latency: the doorbell and the screen are directly connected point-to-point, no APP is required, and the screen displays the doorbell image in real time Easy to install: both the doorbell and the screen support glue and can be directly installed on smooth walls without drilling or wiring Simple pairing: just one click to connect the doorbell and the screen Product name:video doorbell Working humidity:10%-90% Viewing angle:100° Display:4.3 inches SD card:Maximum support 64G Night vision type:LED fill light Power supply information:DC5V/2A storage encoding:MJEPG working temperature:-10℃-60℃ audio information:Built-in speaker, microphone WIFI mode:2.4G private protocol The product appearance and printed words depending on the batch, but this does not affect use. Colour:As Shown Material:plastic Package Contents: 1 * doorbell 1 * display Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.