Gone are the days when only the well-to-do family could install a doorbell when they could afford it, but they were teased by “young buffalo” by ringing the bell and running, making the owner angry. Many people are even so extreme that they don’t even bother installing doorbells to avoid being harassed.
Today, the doorbell has become so familiar and so popular that it is no longer an object of mischief. From cordless bells to wireless doorbells, it’s a huge step forward in terms of convenience because it can be installed almost anywhere without having to drag the wires around. Now on the market, there is a wireless doorbell that never needs to be replaced, making users “more and more leisurely”. So is this product really as advertised?
Open the box and bond
The product set is wrapped in a thin plastic sheet stamped in the shape of a bell, the bottom is a paperboard with a lot of information about the product such as specification, installation, instructions for use, warnings… quite detailed.
Inside is a button, a receiver cum alarm, two screws and a double-sided tape to fix to the gate / door at the discretion of the user.
Rectangular button with the length x width x height is 8.2 x 4.3 x 2.4 cm, respectively. The two upper and lower parts of the button are two plastic strips painted with imitation metal, the middle part is designed to protrude so that it is easy for users to press. On the side of the button there is a small LED light. This light will illuminate when the button is pressed down, indicating that the signal has been transmitted to the receiver. This feature is small but useful, avoiding the case of a broken bell that the customer does not know, so just wait.
Advertised as being completely waterproof, users can safely install the bell outdoors without worrying about damage. In the past, my house used to use China’s “no-name” wireless doorbell, when I bought it somewhere more than 100K and it was not waterproof. I had to cut the water bottle in half on the outside of the button so it wouldn’t get damaged when it rained.
The receiver cum alarm is designed like a computer mouse, 9.6 cm long, 6.5 cm wide and gradually thins from the power plug to the speaker. On the top is a blue plastic strip extending to the sides.
In the middle, below the plastic strip is an LED light. This light can be turned on / off with the button and will light up when the signal from the button is transmitted, and the speaker under the receiver’s belly will sound.
On the bottom is printed installation instructions as well as resetting the bell, so users do not need to worry if they accidentally lose the box.
On the right side of the receiver is a ring style selector and volume up/down button. The manufacturer says there are 32 types of bells for users to choose from.
In my opinion, this is both a plus and a minus because once you have missed your favorite ringtone, you have to press it more than 30 times to choose it again.
When you remove the push button, you will see a circuit board with glued components such as an LED, some resistors, quartz and a torsion spring antenna. The heart of the push button is a copper coil and a magnet – which generates an electric current so that the push button never needs to change batteries.
The principle of electricity generation of this mechanism can be explained by applying the 9th grade physics knowledge about generators with permanent magnets and coils:
The coil is exposed to the magnetic field generated by the magnet. When the bell is pressed, the magnet moves, the magnetic field around the magnet changes the polarity of the atoms in the metal, thereby causing the electrons to be released and generate an electric current.
Practical use
The button and receiver are wirelessly connected by radio waves for high sensitivity and obstacle penetration. The wave receiving distance parameter that the manufacturer offers can be up to 30-100 m, but the other 100 is probably only achieved when in ideal conditions, without obstacles.
I think, for most Vietnamese houses, the above distance is more than enough, because even if the house is 7-8 floors high, it is only about 30 meters. In the video below, I tried it quickly at the electrical and water store, but at a distance of more than ten meters, the bell still caught the signal very well.
On-hand wireless doorbell, no need for batteries, can integrate anti-theft
This bell can be “enhanced” by adding 4 buttons for 1 bell or 4 bells for 1 button to suit customers for shops, showrooms, offices, multi-storey houses, many rooms. Users can even integrate additional detectors and magnetic doors for the purpose of preventing theft.
Conclude
A person detector can be added to expand the capabilities of the bell
The set of bells has a market price that fluctuates around 370K. This price is much higher than Chinese wireless bells, and will be even higher if you buy more buttons or receivers. Therefore, this set of bells will probably be suitable for luxury shops, well-off households living in multi-storey, multi-room ground-floor houses; or the distance from the gate to the big house is over 20m.
Advantages:
+ The button does not need to change the battery;
+ Ability to expand the application range by connecting additional receivers, buttons or transducers (sold separately);
+ Large operating distance;
+ Water resistant;
+ Clear and detailed instructions for use;
Defect:
-High price compared to other wireless bells;
-Too many bell styles make it difficult to choose if you miss the one you like;
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