Cheng Wei all assets of the Chinese division of Uber, including its brand, business operations and data for operation within mainland China. Under the terms of the deal, Wei is set to become a board member of Uber and Uber's CEO also gets a seat on DiDi's board. Since the company was founded in 2012, under the leadership of Cheng Wei and Jean Liu, DiDi has grown to become one of the world’s highest valued tech start-ups. The company has evolved from a simple taxi-hailing app to taxi hailing, private car hailing, hitch (social ride-sharing), bus, minibus, chauffeur service, car rental service,
Acoustic hailing device Acoustic hailing device An acoustic hailing device (AHD) is a specialized loudspeaker that emits high-power sound waves for communicating at a distance. AHDs vary in design, output, and usability. Acoustic hailing devices are acoustic devices capable of outputting highly intelligible sound at very high volumes. The distance at which acoustic hailing can be effective varies based on several factors including the sound level, directionality, and frequency of the acoustic source, the sensitivity and directionality of the receiver, and the transmission channel environment. The sound level diminishes or attenuates with distance. Consequently, as a general rule, higher source levels have greater