English 
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1. Knowledge about Door viewer
1. Principle of door viewer
The door viewer is mainly composed of a concave lens and a convex lens. Concave lens can make the portrait outside the door shrink into the door mirror, forming a three-dimensional virtual image. The convex lens acts as a magnifying effect, allowing residents to see what is going on outside the door. The reason why people outside the door can't see the portrait is that when people outside the door use the door mirror, the concave lens changes into the objective lens, and its focal length is very short. People outside the door cannot see the person in the eyepiece. This principle enables residents to observe and judge the situation outside the door in the safest situation.
2. Door viewer installation
Before installing the door viewer, the customer should measure the specific diameter of the door viewer. Then, drill the suitable hole on the right position of the door and install the door viewer. In fact, after buying the door viewer, most people will choose to ask a professional team for the installation of the door viewer, it will be more safe and cost-effective.
Product Introduction
◇ For body material, we have brass, zinc alloy for choosing
◇ The surface color can be Brass plated or Chrome plated
◇ Easy for installation
◇ Applicable for many doors
Product Parameter
| Model | B08/ B204 |
| Material | Brass |
| Color | Brass plated/Chrome plated |
View angle | 160°/200° |
| Door thickness | Suitable for door thickness of 34mm – 55/60mm |
Product and company advantages
Product Advantage
1. For safety, you can see the situation outside through the door viewer
2. Clear view
3. Competitive price with good performance
4. Easy to install on the door
Product application
Usually the door viewer are applied on the home door.
Packing details
Usually the unit packing is white box, but the packing can be also customized.
Sealed polybag+unit white box+middle box+outer carton
Company introduction
We are specializing in door hardware for more than 10years and we have strict quality control procedures.
FAQ
Q1: What's your MOQ?
A: Usually our MOQ is 3000pcs per type. If we have enough stock, then small quantity is also acceptable.
Q2: How long is your production cycle?
A: Usually it's 60days, it also depends on your order quantity.
Q3: Whether you can provide OEM service?
A: Yes, OEM requirement is welcome.
Q4: How about your quality warranty?
A: When the products got problem during our warranty period, we will provide our best after-sale service to solve the problem for our customer.
1. Knowledge about Door viewer
1. Principle of door viewer
The door viewer is mainly composed of a concave lens and a convex lens. Concave lens can make the portrait outside the door shrink into the door mirror, forming a three-dimensional virtual image. The convex lens acts as a magnifying effect, allowing residents to see what is going on outside the door. The reason why people outside the door can't see the portrait is that when people outside the door use the door mirror, the concave lens changes into the objective lens, and its focal length is very short. People outside the door cannot see the person in the eyepiece. This principle enables residents to observe and judge the situation outside the door in the safest situation.
2. Door viewer installation
Before installing the door viewer, the customer should measure the specific diameter of the door viewer. Then, drill the suitable hole on the right position of the door and install the door viewer. In fact, after buying the door viewer, most people will choose to ask a professional team for the installation of the door viewer, it will be more safe and cost-effective.
Product Introduction
◇ For body material, we have brass, zinc alloy for choosing
◇ The surface color can be Brass plated or Chrome plated
◇ Easy for installation
◇ Applicable for many doors
Product Parameter
| Model | B08/ B204 |
| Material | Brass |
| Color | Brass plated/Chrome plated |
View angle | 160°/200° |
| Door thickness | Suitable for door thickness of 34mm – 55/60mm |
Product and company advantages
Product Advantage
1. For safety, you can see the situation outside through the door viewer
2. Clear view
3. Competitive price with good performance
4. Easy to install on the door
Product application
Usually the door viewer are applied on the home door.
Packing details
Usually the unit packing is white box, but the packing can be also customized.
Sealed polybag+unit white box+middle box+outer carton
Company introduction
We are specializing in door hardware for more than 10years and we have strict quality control procedures.
FAQ
Q1: What's your MOQ?
A: Usually our MOQ is 3000pcs per type. If we have enough stock, then small quantity is also acceptable.
Q2: How long is your production cycle?
A: Usually it's 60days, it also depends on your order quantity.
Q3: Whether you can provide OEM service?
A: Yes, OEM requirement is welcome.
Q4: How about your quality warranty?
A: When the products got problem during our warranty period, we will provide our best after-sale service to solve the problem for our customer.
