WHD UPM 200-4 White, Broadband Built-in Ceiling LS System, Rated power: 6/8 W, Impedance: 4 Ω, Frequency range: 60 - 20,000 Hz, Colour: RAL 9003 white, Without transformer, For ceiling thickness from 1 to 32 mm, Water-resistant cone, Outer diameter: 198 mm, Ceiling cutout: 168 mm, Installation depth: 54 mm,