Califone PA283 Bluetooth Voice Saver Tour Guide System demo Two black speed control knobs purple sunburst Two black speed control knobs have been dialed in to Van Halen's exacting specifications the smooth feeling 500k pots make it easy to find a unique sound while retaining the crisp high end sparkle of the Wolfgang pickups 4 element glass diopter for incredible accuracy with a wide 4 to +4 focus adjustment Weight: 10 oz (283 g) (including batteries) Includes wireless headset for complete hands free flexibility and movement6 8 hours use on a single charge and can still be used while batteries are rechargingVocal assistant helps prevent throat fatigue