Features: Concealed design: it can concealed inside wall, not exposed to the outside, beautiful and generous. Five-speed regulation: with five gear, the user can choose different gear according to the need to flexibly adjust the wind speed. Bands speed regulation: use bands speed regulation technology, can achieve smooth adjustment of wind speed, reduce the wind speed change in the sudden change of feeling, improve the comfort of use. Easy installation: simple design, easy installation, can be easily installed on 86 type wall switches panel. Quality material: craft from quality materials, with strong durability and reliability with long service life. Specifications: Material: ABS+Copper Size: about 8.6x8.6cm/3.38x3.38inch Mounting Hole Distance: 60mm/2.36inch Power: ≤500W Package Includes: 1x 86 Type Fan Speed Controller note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.