Which POE module?

I am using Cisco Catalyst 2960S-48LPS-L - it “supports both IEEE 802.3af Power over Ethernet (PoE) and IEEE 802.3at PoE+”

I have 4x Banana Pi BPI-P2 Zero.

Which voltage do I need? For RT9600 POE Module, there are 4 voltage output options: 3.3V, 5V, 12V, or 24V.

you need chose 5V for BPI-P2 Zero