The Nekinsan Smart Wireless Video Doorbell offers an innovative, contactless solution for home and office security. Utilizing a QR code sticker, it enables visitors to initiate communication without the need for traditional doorbell hardware.

1. Ease of Installation:

• Wireless: Setting up a wireless doorbell is generally a breeze. You typically mount the doorbell button with adhesive or a few screws and plug the receiver into an electrical outlet. No complicated wiring or drilling through walls is usually required, making it a fantastic DIY project.
   
• Wired: Wired doorbells often necessitate running wires through walls and connecting to your home's electrical system. This can be complex, time-consuming, and might require professional installation, adding to the overall cost.  

2. Flexibility in Placement:

• Wireless: You can place the receiver of a wireless doorbell virtually anywhere within the signal range. This is particularly useful in larger homes or if you want a chime in multiple areas. Some wireless doorbells even have portable receivers you can carry around. 
   
• Wired: The placement of a wired doorbell chime is limited by the existing wiring. Relocating it can be a significant undertaking.

3. Portability:

• Wireless: If you rent your home or plan to move, a wireless doorbell can easily come with you. Removing it is as simple as unplugging the receiver and detaching the button.
   
• Wired: A wired doorbell is a permanent fixture and cannot be easily moved.

4. Aesthetics:

• Wireless: Without the need for visible wires, wireless doorbells can offer a cleaner and more modern look to your entryway.
   
• Wired: Wires can sometimes be unsightly and limit your aesthetic choices.

5. Power Outages:

• Wireless: Battery-powered wireless doorbells will continue to function even during a power outage, ensuring you don't miss visitors.
  However, if you use NekInsan QR code for Doorebell, then you do not require any battery backup, as it is just a QR code that can be scanned with any QR code application.

• Wired: Wired doorbells rely on your home's electrical supply and will not work if there's a power cut.  

In conclusion, while wired doorbells offer consistent power and a reliable signal, the ease of installation, flexibility, advanced features, and portability of wireless doorbells make them a better choice for many homeowners today.

The convenience and modern functionalities they offer often outweigh the minor inconveniences of battery maintenance or potential signal issues.