The DC port over the battery unit is a "female" a single, and to connect it to the LED strip, the incldued male-to-male cable is often used.
The COB LED Flex Strips maintain a whopping 512 LEDs for each Meter which https://socialbookmarkgs.com/story18379018/how-industrial-style-lighting-for-home-can-save-you-time-stress-and-money