Integrated mobile phone shell capable of telescopically storing Bluetooth earphone - GAO XINYI; SUN WANG; YANG MEIZHEN; WANG ZHAOGUO; ZHANG XINGZI; LI DELONG; FENG YULE; LIANG YUANYUAN; YANG TINGHUA (2022)
Keywords: DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; PUBLIC ADDRESS SYSTEMS; TELEPHONIC COMMUNICATION