Abstract: An electrochromic composition including: a first oxidizable compound; a reducible compound; an electrolyte; and a solvent, wherein the first oxidizable compound is represented by the following formula: wherein X1, and X2 are independently substituted or unsubstituted aliphatic hydrocarbon groups, or substituted or unsubstituted aromatic hydrocarbon groups, wherein the aromatic hydrocarbon groups include: wherein each Rx is independently hydrogen, a C1-C16 alkyl group, a C1-C16 alkoxy group, a C1-C16 haloalkyl group, or halogen.

Abstract: A wearable device capable of indicating direction is provided, including a wearable module, a plurality of acoustic wave sensors, a plurality of vibrators, and a control module. The wearable module is adapted to be worn on the user's body, the acoustic wave sensors and the vibrators are disposed on the wearable module in different directions. The control module is electrically connected to the acoustic wave sensors and the vibrators. Each acoustic wave sensor is driven by a sound signal generated by an external object to generate a response signal, the control module receives and compares the response signals to recognize the direction of the external object, and controls the vibrator to generate the vibration signal.