OdiySurveil(TM) 10 inch(30cm) 2.1 x 5.5mm DC Power Pigtail Female Cable (Pack of 10) Center positive 2.1mm DC plug, as universal usage, RED wire for DC+,BLACK wire for DC-; Length: 10 inches, Easy installation; Outside diameter: 5.5mm; Can find DC pigtail male cable in OdiySurveil; All cables passed FCC,CE and ROHS, and will be recyclable .