A commercial cellular repeater or cellular booster is a type of bi-directional amplifier (BDA) as commonly named in the wireless telecommunications industry.  The device is used for boosting the cell phone reception to a designated through the usage of an antenna for reception, an amplified signal and an internal rebroadcast antenna.

A signal booster an interchangeable term for cellular repeater, cell phone repeater, or wireless cellular signal booster, a type of bi-directional amplifier (BDA) as commonly named in the wireless telecommunications industry.