Futon sofa, can be converted to sleeper in few seconds. - The click-clack mechanism to ensure conversion between seating / lounging/ sleeping positions. 2 angles for adjusting. Futon sofa, can be converted to sleeper in few seconds. - The click-clack mechanism to ensure conversion between seating / lounging/ sleeping positions. 2 angles for adjusting. Futon sofa, can be converted to sleeper in few seconds. - The click-clack mechanism to ensure conversion between seating / lounging/ sleeping positions. 2 angles for adjusting.