VSB Automatic Pop-hole Door Opener - internal
Internal VSBbi Chicken House Door Opener (inside Granary Henhouse)Internal VSBbi Chicken House Door Opener with batteries and light sensorInternal VSB unit fitted inside a Stroller Chicken CoopCircuit Board layout inside the VSB unit

VSB Automatic Pop-hole Door Opener - internal  Ref: VSBbi
VSB Automatic Chicken Coop Door Opener for mounting inside your Hen House and using an external light sensor.
Battery operated, light sensitive pop-hole door opener.
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