4 pin - JACK FEMALE - Hirose HR10A HR10A-7J-4S (FULL SET)
Description: all metal compatible connector with rubber band. Full set including all you see in pictures. At the back it has numbered each pin for ease of soldering (maybe not visible in pics)!
Warning: This is not original Hirose brand, but it does the same job/function as Hirose brand. I am using "Hirose" as a description of function (kind/type of connector). I am not trying to misuse Hirose brand.