WHD UP 10-T6, Broadband Built-In Ceiling LS System, 8 cm, 6/8 W, 150-20,000 Hz, RAL 9016 white, With 6 W / 100V transformer, Incl. mounting material for ceiling thicknesses from 1 to 20 mm, Outer diameter: 140 mm, Installation depth: 72 mm, Ceiling cutout 120 mm, Weight: 1.1 kg, Very easy, tool-free assembly