VSB Automatic Door Opener

After having used 3 VSB Automatic Pop Hole Openers and having just bought a forth, for another hen-house, I thought it was about time I wrote a review!

Automatic Door OpenerI first bought a VSB door opener made by AXT Electronic in 2007 and have had some time to get to know them pretty well.

If you are not familiar with these devices, let me give you a little bit of background information about what they can do and how they work.

The VSB automatic door opener can open and close the pop hole of your hen-house at dawn and dusk to help protect your chickens from unwanted night-time visitors like foxes and badgers (or raccoons in some other parts of the World such as North America).

AXT VSB Automatic Door InsideThe unit comprises a printed circuit board that has a conformal coating (a kind of varnish that keeps moisture off the components) and is mounted inside a weather proof plastic ABS box.

The unit is powered by 4 x ‘AA’ size batteries that mount in a carrier inside the box that last up to 2 years depending on the weight of your door and the quality of the batteries you use.

A small motor is used to lift the pop hole by winding in a very fine (but very strong) cord.

Automatic door opener options

There are a few different versions of pop hole openers available:

The VSB – For mounting on the outside of your hen-house, this is the basic model.

The VSBbi – Which is designed to be mounted in the same way as the VSB but inside the hen-house. It includes an external light sensor on an extension wire, designed to be mounted outside the hen-house.

This is the option I have always gone for as firstly it makes the VSB unit much less obtrusive and secondly provides extra protection for the unit against harsh weather conditions.

Although the unit is mounted inside a plastic box, there are still holes on the bottom of this for the cord and (optional) timer cable to pass through. When mounting the unit inside, the sliding pop hole door should also be fitted to the inside of the hen-house but do be careful as not all hen houses can accommodate the VSB and an internal pop hole door inside.

Battery timer

Automatic Door Opener Electronics
Battery Timer Unit (Left) and VSBi (Right)

There is a battery timer (available separately) for the VSB pop hole opener that can override the VSB opening and closing signals from the light sensor. The reason for wanting to do this is that the standard unit will open the pop hole when it gets light so during the summer months when it gets light at 4am, it stops the automatic door from opening when birds such as cockerels can disturb your sleep and before people are around. Remember, you can still have a visit from Mr. Fox in the early hours when things are quiet.

I set the timer to open the door at 7am, and then it closes as normal at dusk. The timer is powered by one D Cell Battery, and is very easy to install by pushing on two connections to the main VSB door opener.

I have heard from a number of people who have lost birds in June / July when vixens are feeding cubs and their hens have been let out too early in the morning as it gets light. We would advise you to consider the timer if you buy one of these door keeper units.


As you will probably appreciate, now owning 4 VSB automatic door keepers must say something about how useful I find these units. The units are well constructed using modern surface mount technology and are suitably waterproofed for their environment. The real test has been the test of time and other than replacing the batteries and replacing the cord once (on a pop hole that is made from 18mm ply and is rather heavy) in 4 years, I can recommend these units without reservation. You won’t have to worry about locking the chickens up again if you are away when it gets dark, providing you replace the batteries every year and check the cord over for wear and tear from time to time.

VSB Automatic Door Opener

VSB Door CloserThe cost of the VSB far outweighs the cost and pain of losing your chickens to a predator.

You can buy VSB Automatic Door Openers on Amazon they have a selection of companies selling this product.

Update 2015: There are now other companies offering similar products that you can see here.

The following two tabs change content below.

Tim Daniels

Tim is the founder of the poultrykeeper website and lives in Herefordshire, UK. He keeps Cream Legbar chickens, Silver Sebright bantams and hybrid layers for eggs, Abacot Ranger ducks, Brecon Buff geese and some quail.

Latest posts by Tim Daniels (see all)

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.