OMNIHIL Adapter Plug Converter 5.5mm x 2.1mm Female Plug to 4.0mm x1.7mm Male Plug Connector converting from: 5.5mm x 2.1mm Female Plug to 6.5x4.4mm with Pin Male Plug Female Plug: 5.5mm x 2.1mm Male Plug: 6.5mm x 4.4mm All products are tested to exceed/meet standard specification OVP, OCP, SCP Protection (OVP: Over Voltage output Protection. OCP: Over Current output Protection. SCP: Short Circuit output Protection) FREE RETURN SHIPPING / 5 YEAR FREE WARRANTY