Does power: 20 w; Does constant impedance input: 8 Ω; Does frequency response: 100 hz - 20 KHZ; Does the sensitivity: 88 + / - 3 dB; Does the ceiling openings: Φ 170 mm; Does decorative cap size: Φ 203 * 80 mm; Does the installation forms: type suction a top; Does the material: ABS; Does weight: 1.25 kg; Does the speaker unit specification: 5 "* 1 + 1" * 1;