PLEASE NOTE: THIS DEVICE IS NOT SILENT. IT GENERATES A SPECIAL SOUND. Why do you need the Audio Jammer, If you have conversations in person, that require you to discuss sensitive or proprietary information, you may be at risk of a wireless microphone or audio recorder being used to spy on your conversation. Kinds of listening devices rendered useless by the “Audio Jammer” is effective against any microphone based eavesdropping device including: tape recorders, RF transmitters, hard-wired microphones and shotgun microphones. It even protects against microwave or laser reflection pickups. The Audio Jammer varies it's frequency and amplitude randomly, making it so that it cannot be easily filtered. The only sound an eavesdropper will hear is the Audio Jammer noise. The convenient end-mounted control lets you select the level of protection for your situation. One unit will protect up to 200 sq. ft. For protecting rooms larger, we recommend an additional Audio Jammer for each 200 sq. ft. of area. This is our new version that is rechargeable instead of utilizing a 9v battery and almost twice as powerful. Specifications: •Unit Size 3.5” x 2.5” x 1” •Controls: Power and Volume Protects up to 200 sq ft of space Included with this item: 1x - Charger 1x- Audio Jammer “ If you have any questions about the product please contact us through eBay. “