DXOPHIEX Automatic Fish Feeder

Our automatic fish feeder! Schedule feedings every 8, 12, or 24hrs, or feed manually. Dual power supply with AA batteries or USB cable included. Fix it on tank edge or hood with stent or funnel base. Two feeder containers (100ml & 200ml) & feeding ring included. Easy to adjust feeding volume & suitable for all types of fish food. Get it now for your pet fish!

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How do I add the screw attachment????