- One-Way, Self-Amplified, Black Wall Speaker for offices, retail environments or for inconspicuous appearance on dark surfaces.- Utilizes Standard Telcom/Datacom Wiring CAT 3/5/6- Easy Install- Built-In Amplifier- Built-In Volume Control on One-Way Speakers- Corridor Speakers Produce Bi-Directional- Sound for Long Hallways- White is Ideal for Medical or Laboratory- Black is Inconspicuous On Dark Surfaces- Dimensions: 9.7" H x 11.5" W x 4.0" D (24.63 cm x 29.21 cm x 10.16 cm)- Weight: 4.6 lbs (2.09 kg)