Does power: 5 w / 10 w; Does constant pressure input: 70 v to 100 v; Does frequency response: 110 hz - 20 KHZ; Does the sensitivity: 87 + / - 3 dB; Does the ceiling openings: Φ 155 mm; Does decorative cap size: Φ 184 * 65 mm; Does the installation forms: type suction a top; Does the material: ABS; Does weight: 1.0 kg; Does the speaker unit specification: 4 "* 1 + 1" * 1;