ITEM NAME:DC 9V PP3 Battery Holder Box Case Wire Lead ON/OFF Switch Cover + 2.1mm Plu F9I6 DC 9V PP3 Battery Holder Box Case Wire Lead ON/OFF Switch Cover + 2.1mm Plu F9I6 Hold 1 standard 9V battery. With cover and switch, it can be used as a perfect external power source. Environmental-friendly; Battery Not included. Spring: No Wire Rod: 1007# 24AWG Length of Revealded Wire Rod: 300mm Color: Black External Connection: 2.1 x 5.5dc RP-SMA Male Plug Size: 5.5 x 2.1mm Material:Plastic Colour:Black Quantity: 1 pcs Package Contents: 1 x Battery Holder Box Case Wire Lead ON/OFF Switch Cover 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.