Speaker selector unit, play thro' 1, 2 or both pairs (Henleaze Ward BS9)

Used it to switch from speakers in one room to the speakers in different room, or both. This was for wired speakers. The deck and amp were in one room but this meant I could choose where to listen. You'd need to know how to set it up. Collect from Kellaway/Horfield Common area. Please tell me collection plans when you reply.