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[About clocks that synchronize time via radio waves] The function of clocks that synchronize time via radio waves only works in the Japanese area. Please be careful. Bone Conduction Earphones, Wireless Earphones, Earphones, Bluetooth, Earphones, Bluetooth Earphones, Bluetooth Earphones, Headphones, Nroae Bone Conduction Headset, Bone Conduction Wireless Earphones, Open Ear Earphones, 10 Hours Playtime, Type-C Fast Charging, Ultra Lightweight, Comfortable Wearing, No Tired Ear Sports/Desk Work/Outdoor (Black)