@Smiler57 
Look at the adapter Voltage (V) and (A) rating.

Just look for a longer power adapter online with the same correct pin size for the deco, with the same voltage and ampere rating, it should work.

  @Omochao trouble is the adapter doesn't give the pin sizes!

  @Smiler57 

Search on Amazon for "security camera power extension cable"

You will need the most common one, with barrel plug size 5.5x2.1 mm (could also be labeled as 2.1x5.5 mm)