Features and Benefits: ?RECHARGEABLE TOUCHSCREEN CONTROL UNIT 4.3? LCD touchscreen control unit displays the active channel and sound analysis such as peak, average, and real-time noise levels RECHARGEABLE WIRELESS TRANSMITTERS Includes four wireless transmitters and piezo microphone clamps to broadcast sound digitally from suspected trouble areas. Expandable to six channels. SPECIFICATIONS: ? Listen to and diagnose noise, vibration, and harshness from up to 6 locations wirelessly during road tests ? 4.3? LCD display Mini Tablet Touchscreen control unit ? Rechargeable Batteries for control unit and all transmitters. ? Includes high fidelity stereo headphones and durable canvas storage bag