Review on Mic-Lock 3.5mm - SOUNDPASS Microphone Blocking Device for Smartphones, Laptops, Tablets - 🔒 Audio Security, Privacy, Counter-Surveillance - Prevent Eavesdropping - Enjoy Music Safely - 1 Pack by John Collins

The only REAL mic blocker with the right load to mute device, with inclusion of external mic mode, as opposed to cheap Connectors that just short will only block the connection to the internal microphone - it's useless. What's also great about these devices is that you can manually override them by manually selecting speakerphone, so you don't have to unplug the device, especially if you forget it's plugged in and answer a call. Too bad they didn't offer a Lightning version without SoundPass. SC