4Pcs Amplifier Speaker Binding Post & 1 set Coil 4PDT 14 Pins Electromagnetic Relay and high quality. Compact, reliable and durable. Insulated post, external parts insulated. Easy installation with screws locking and easy to use. Suitable for 4mm banana plugs, spade terminals or bare wire. Speaker Terminal Binding Post: Material: plastic+copper Connections: Soldered color:transparent color&black&red Size: approx. 14.5mm dia. (max). 32mm height Electromagnetic Relay: Model No.: HH54P Socket Model No.: DYF14A Coil Voltage: DC 12V Contact Capacity: 5A 250VAC /28VDC Type: 4PDT Number of Terminals: 14 Mount Rail Type: 35mm DIN Rail Fixing Mount Hole Size: 6 x 4mm/0.24inch x 0.16inch(L * W);Total Size (Approx.): 68 x 29 x 65mm/2.7inchx 1.1inch x 2.6inch (L * W * H) Shell Material: Plastic Main Color: Black, Clear Blue 4NO 4NC type, built in green indicator light. Can adjust automatically, protect and transform the electric circuit. Used widely in the remote control, communication, automatic control system, electronic equipments, etc. Package Contents: 4 x Speaker Terminal Binding Post(black and red each 2 pcs) 1 x Electromagnetic Relay