1.Product Name: Anti-recordering/Anti-eavesdropping equipment. 2.Working Principle: Ultrasound interference. 3. Remote Controlling: Comes with a wireless sensor remote controller, which can realize remote control of device switches and operations. 4. Function: Protect your privacy and prevent eavesdropping. 5. Other Function: Working as power bank. Application Scenarios: Company metting, Business interview, Personal communication ,Confidential conversation and so on. Colour:black Material:aluminum alloy Package Contents: 1 x Handheld Anti Recording Scanner Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.