The mouse and keyboard are connected to two of the ports on the usb hub and the usb hub is connected to an otg cable which converts usb to micro usb (as i have an older phone). I got the hub at a local tech shop for around 10$ , only found it online in the indian amazon (sadly its unavailable right now) here's an amazon link :https://www.amazon.in/eCart-MAXICOM-Hi-Speed-Individual-Switches/dp/B079JGB848 Or the most similar one i found is this one:https://www.amazon.com/Sabrent-Individual-Switches-Included-HB-UMP3/dp/B00TPMEOYM/ref=mp_s_a_1_12?keywords=4+port+usb+hub&qid=1581454562&sr=8-12