Model BL-VD01 Product: Video Door Phone Technical Specification Model BL-VD01 Power source: AV110v-240V Screen: 3.5" TFT LED Operation Temperature: -10-+45 External dimension: Monitor 255(L)X 190W)X 58.5(H)mm Camera 126.5(L)X 97W)X30.5(H)mm Installation: surface-mount Features: Visitor calling, video intercom, unlock, monitor With hand-move warm threaten function With prevent demolish alarm Should you interesting in this product or others, please contact me at Julien at or Julien at . We will give you reply as soon as possible. Thanks in advance.