Water prevented 17cm micro USB 5V input black cable, 3.3W blue tooth temperature controllable heat pad with built in thermal sensor for various kinds of scarf, heat pad, or cousin DIY products. Chinese Introduction Film : https://youtu.be/ieW9xvtB23g English Introduction Film : https://youtu.be/plDCzrfDS_4 Facebook : https://www.facebook.com/btcheatproduct360/