Keeping Your Conversations Private. Plug It Directly into Your Devices Headphones Jack & Its Smart Chip Simply Blocks Audio Hacking on Smartphones, Tablets & Laptops So You Can’t be Heard by Malicious Third Party. Ergonomically Designed in Aluminium Metal & Plastic, Available in Black or Grey & Can be Branded in Up to 2 Spot Colours. Easy to Pop in & Out, Designed to Fit Flush with Your Device. Minimum Quantity: 100.