A pillow has a supporting structure, a cushion, multiple flexible sensors, and a controlling unit. The supporting structure has a supporting plate. The supporting plate has multiple supporting elements disposed at intervals. Each of the supporting elements is sheet-like. Each of the supporting elements is independently deformable by being independently pressed and independently restoring. The cushion is elastic and is supported by the supporting structure. Each of the flexible sensors is mounted to a corresponding one of the multiple supporting elements. The controlling unit is electrically connected to the multiple flexible sensors. When a user rests his head on the pillow, the user may press the flexible sensors to control a controlled device such as a speaker or a projector.