21V 1.5A AC/DC Adapter Power Supply Charger with 5.5x2.1mm

Input power:                  110-240V, 50/60Hz   
 jack size :                      5.5mm x 2.1/2.5mm
Output:                          21V - 1.5A; Compatible for 1.0A,0.75A,0.5A as amperage isn't forced
power plug :                   US
Size:                              82mm x 50mm x 33mm
Length of the cable:        36"
Color:                            Black
Weight:                         3.5oz
the adapters Connector : inside positive (+) outside negative (-)