What is the use of those metal pins protruding out on back side of lumia 730?

[Windows Central Question]

These metal tips get pushed agiaint the metal points provided in the back panel

 

[jazen]

There are 2 pairs of pins on the back of a 730/735 under the cover. The 2 at the top near the camera lens are for the NFC antenna. The 2 on the bottom are for the Qi charging pad. If you have a compatible battery cover, it will match up with the pins.