ITEM NAME:9V Volt Battery Holder Box Case Plug 5.5X2.1 for Arduino Breadboard Power Sup N2 9V Volt Battery Holder Box Case Plug 5.5X2.1 for Arduino Breadboard Power Sup N2 Great kit to supply power to your breadboard's power supply Connector plug for Arduino colour:Black size:5.5mm X 2.1mm Material:ABS Package Contents: 1 x Battery Holder Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Connector plug for Arduino. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.