... /Off switch with adjustable volume control. 2.Auto-adjust head band. 3.Uses 2xAA batteries (not included) 4.providing approx. ... adequate care, this sound muffler provides excellent protection by filtering out high frequency noise caused by machinery, motors, saws, and gunfire. 1 ... voltage is too low, circuit will not operate. StaticA broad band microwave device, such as a cell phone, is transmitting ...