Mount-It! - Flip-Down Under-Cabinet & Ceiling TV Mount – Fits 19″–37″, 90° Tilt, 45° Swivel, 44 lb Capacity - Black

Yes, as long as your 40" television weighs under 44 lbs, has a VESA mounting pattern of 200x200 mm or smaller, and its total height allows enough clearance so it doesn't hit the cabinet or ceiling when folded/extended, it will work with this mount!

Great question! To lower your TV from the ceiling, you don't need to look for a physical lever or button; instead, the mount features a press-and-release mechanical latch. Simply push the folded TV and mount firmly upward toward the ceiling until you feel or hear the latch click open, then gently pull the assembly downward to your preferred viewing angle (it can rotate down up to 90°). If the folding motion feels too stiff or loose, you can easily adjust the tension by popping off the plastic joint covers and using a 6mm Hex wrench to tighten or loosen the main joint screw.