Simple DC Junction wired for centre negative only. Accommodates your typical 2.1mm barrel. 
 
50mm x 50mm x 33mm [ L x W x Height] 
 
UK Postage & International Postage - this item has to be sent small parcel due to its dimensions, therefor postage price is £5.00. However, you can purchase anything else from the website at the same time and postage will not increase.