You are buying 1 BOSCH compatible quality 40A relay, TMC brand

Description:

• DC 24V 5 pin relay.
• (SPDT) Single Pole Double Throw / 2-Way
• 40A High Switching capacity
• Water Resistant Sealed
• Built-in Bolt bracket
• Features 5 pin layout that accepts female spade terminals.
• Great for adding car stereo, alarm system remote start, fog lights, undercar lighting, turn on dome light, shared door handle, trunk release, reverse polarity, door locks, horn and more.

Terminal Configuration:

Pin 85:  24V+ Positive (Coil trigger) 

Pin 86:  24V- Negative (Coil trigger) 

Pin 30:  Power Input

Pin 87:  Normally Open Output

Pin 87a:  Normally Closed Output

12V Relays available in the following listing:  

https://www.ebay.com/itm/234489983801