Attenuators (also called RF attenuators) are designed to reduce the power level of a cellular signal by a specified amount, known as a dB (decibel) gain. Attenuators are used in special situations when the incoming signal from a nearby cell tower is too strong and overloads the system. They reduce the force of the signal by 3dB, 6dB, 10dB, or 20dB, allowing the booster to operate properly.