Speak Easy! MAKE conversation PRIVATE! SECURE that Cell or PDA so that YOU will NOT be OVERHEARD! Disables Microphone AND Disables Speaker/Earpiece For Wireless Devices with 2.5mm Audio jacks... Blackberry, Cell phones, PDA's and similar. Nickel-plated Brass SILENCING plug attached to a Snap Hook and credit-card-style Instruction Card. Easily Snaps to your Key Chain.