Does power: 10 w / 20 w / 40 w; Does constant pressure input: 70 v to 100 v; Does frequency response: 60 hz - 20 KHZ; Does the sensitivity: 93 + / - 3 dB; Does the ceiling openings: Φ 240 mm; Does decorative cap size: Φ 270 * 105 mm; Does the installation forms: type suction a top; Does the material: ABS; Does weight: 2.1 kg; Does the speaker unit specification: 8 "* 1 + 1" * 1;