WHD UPM 140-T6 White, Broadband Ceiling Installation Speaker System, Power: 6-8 W, Frequency response: 100 - 20,000 Hz (-10 dB), Colour: RAL 9003 white, With 6 W / 100V transformer, Mounting material included, For ceiling thickness from 1 to 28 mm, Cutout 115-124 mm, Water-resistant cone, Very light, tool-free installation via mounting ring