Reference:
ML517
The power adapter allows you to connect a PSU equipped with 2.1/5.5 socket to the HIKVISION DVR equipped with four pin power supply. Operation voltage: 30VDC. Current max.: 5,0A. Plug – socket: JACK 2,1/5,5 (male). Plug – plug: DIN4 (male). Wire Run Length: 10 cm