Onite 4pcs DC Plugs Small Electronics and Devices Universal 5.5x2.1mm Jack to Plugs 4.0x1.7mm, 3.5x1.35mm, 3.0x1.0mm, 2.5x0.7mm, 1pcs USB to DC 5.5x2.1mm Cable (4+1) PLEASE NOTE: The size are listed in the products description below clearly, we suggest you to measure your DC interface size of your laptop or device, and make sure what size you want. These DC connectors are used for laptop repairing, parts replacement, external power source or on-board transformer. We are not responsible for wrong purchase by yourself, but we provide free return and purchase guide. Handy connector works good for multiple applications: power your mobile devices from an external battery pack, making a battery box as a prepare thing, repair the different size of DC interface devices, replacement for laptop / notebook / tablet / mobile phones power adapter parts. Pros: Tips for conceivably most of DC powered device you can imagine; Works well with USB car chargers that can deliver enough amps. PACKAGE CONTENTS: 4x different size of DC tips/connectors/plugs/jacks(please refer to the clear parameter and size in the below description: 4.0*1.7mm, 3.5*1.35mm, 3.0*1.0mm, 2.5*0.7mm), 1x USB to DC 5.5x2.1mm power cord