Does power: 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 210 mm; Does decorative cap size: Φ 240 * 155 mm; Does the installation forms: type suction a top; Does the material: ABS; Does weight: 2.2 kg; Does the speaker unit specification: 6 "* 1 + 1" * 1;