Exuun 8 inch Micro USB Male to Micro USB Male OTG Cable Mutual Charging Cable (Black) micro USB to micro USB OTG cable mutual charger cable can connect two mobile phone for emergency charger, and please noted that the triangle logo on the cable indicates the charging direction. Plug Controllers (PS4), Keyboards, and Cameras into phone. Charge one phone with another. Will only work with phones that have the OTG function. Easily identify OTG side (with white triangle) vs Data/Charge Side