Does power: 20 w; Does constant pressure input: 70 v to 100 v; Does frequency response: 100 hz - 20 KHZ; Does the sensitivity: 88 + / - 3 dB; Does the ceiling openings: Φ 180 mm; Does decorative cap size: Φ 213 * 161 mm; Does the installation forms: type suction a top; Does the material: ABS; Does weight: 1.4 kg; Does the speaker unit specification: 5 "* 1 + 1" * 1;