Set Model Number: VS-SGZ20L Doorphone Master Unit: VS-MGZ20 Doorphone: VS-VG562 Operation confirmed. Compared to the previous listing, this unit was installed on a gate and was completely outdoors. However, it was only used for about six months, so there is no noticeable damage and it is generally in good condition. The master unit shows some signs of use: - Minor scratches on the surface of the LCD screen (Image 9). The screen is not difficult to see. The scratches are only visible when held up to the light. - Scratches on the back (Image 15). The two waterproof sheets that attach to the screw holes in Image 4 will be attached to the screw holes as shown in Image 5. There are two wall-mounting screws included. Everything in the images is included, and there is no instruction manual. Thank you.