by Habr

Vilianov: But the voice speaker 5s, frankly, surprised me. Externally, it is almost no different from its predecessor, only larger (in the photo on the left). But behind it there are not two contacts, as in the absolute majority of analogues in devices of any brand, but four! Why so much is unclear.

Ogi: Two contacts transmit the voice to the interlocutor, and two more send it to the NSA.