- Bogen self-amplified ceiling speaker- 1 Watt- Ceiling grille with a detachable knob for volume control- 8" Cone speaker- Self-contained 1-watt amplifier- Interfaces with standard 600-ohm telephone line- Built-in volume control- Front-mounted volume control with detachable knob- 2 Year manufacturer's warranty- White- BGASWG1DK