Does power: 7.5 W / 15 W / 30 W; Does constant pressure input: 70 v to 100 v; Does frequency response: 90 hz - 20 KHZ; Does the sensitivity: 90 + / - 3 dB; Does the ceiling openings: Φ 200 mm; Does decorative cap size: Φ 230 * 90 mm; Does the installation forms: type suction a top; Does the material: ABS; Does weight: 1.6 kg; Does the speaker unit specification: 6 "* 1 + 1" * 1;