A secure peripheral device, coupled to a computer, capable of enabling a user to use a peripheral device such as a microphone, speakers, headset or video camera when the device is in operational state, while giving to the user a clear visual indication that the device is enabled. The device simultaneously disables the user peripheral device; and turns off the visual indication when the secure peripheral device is in secure state. The operational state is activated by the user by pressing a momentary push-button switch. A timer resets the device to a secure state after a short preset time. The device has antitempering functionality and becomes permanently disabled if tempered with. Optionally the device is coupled to the computer via a USB port that powers it.