Keep conversations private with these imprinted microphone blockers! A very hot promotional item for many industries, this blocker gives more brand impressions than any other product on the market while also providing privacy protection for your clients. It's designed to fit computers, laptops and tablets and it simply plugs into your devices audio jack, making your device think there is an external mic, thus blocking all potential eavesdroppers. The blocker comes standard packaging, which is great for post cards, business cards or bulk direct mail campaigns.