At my first conveyance of this set worked the male part, the handset to pin produced to high beep with 7000 Hz, but a deeper, rasping sound. But it would also produce the former sound. After returning and re-ordering and delivery both devices were apparently useless because it was exactly the same as before the handset again, the male part made no sound at all out. So crap in, comes from China, well, at least not to be recommended!
