This is a Mezzanine Connector DF37 Series 10Pin 0.4mm Pitch SMT Gold Plated Board to Board or Board to FPC Connector from Hirose Electric. This high-density space-saving design has a minimum connector width that still provides a sufficient vacuum area for easy pick-and-place mounting. This series utilizes a thin wall to insulate the bottom surface of the connector and maintains an effective mating length of 0.2 mm. This removes any restriction for PCB pattern layout design under the connector. When mated, the connector’s design covers the contacts which help to keep dust and other debris away from the contacts. The SMT leads are kept very close to the connector housing which also helps to prevent shorts caused by debris on the exposed contacts. This connector is designed to be thinner and smaller, such as mobile phones, wearable devices, tablets PC.