Fukushin is a Japan made solar cell auto feeder which is a well recognized brand among professional  Koi breeders and dealers in Japan. Since it's weatherproof so it could  be installed both in and door. The capacity of the container is 17 L.and can feed up to 12 meals a day . Pair with 3 mm. high grade stainless steels weatherproof  stand compatible with FUKUSHIN PFX .  You can choose between with and without screw holds  designs.