【DC5521 Female End】Connects to male DC 5.5 X 2.5mm connectors such as power adapter or battery housing with such male connector 【KST 2.5mm 2 Pin Micro Male End】Use this end to connect to electrical appliances, automobiles, robots, lighting, toys, PCB control panel, speakers, audio, batteries 【Cable length: 14 inches】 14" from end to end. This cable connects to FixtureDisplays cellphone locker mother board for external power supply 【Recommend Battery Housing】https://www.wayfair.com/school-furniture-and-supplies/pdp/fixturedisplays-d1-battery-housing-battery-pack-holder-dc-connector-hard-plastic-battery-housing-13159-fxtu4335.html 【Product Video】Video Instructions link: https://youtu.be/iS_1gr1yMQ8. You can also search "15260 calbe cellphone locker external power source DC 5 5x2 1 connector fixturedisplays" on youtube to locate the video. You can also download video by following this link: https://www.fixturedisplays.com/video/15260.AVI