Water resistance specification: 20 atm water resistance function;Mobile Link function that enables function interlocking with a compatible smartphone via Bluetooth communication;Shock-resistant structure to resist shock and vibration;Supports distance measurement, useful for training such as run Please note that some of the models are made exclusively for Japanese market, hence the specifications and interface language is all in Japanese and cannot be changed to a different language. If there is no stock, it may be canceled after notification. ## Voltage For electronic equipment, it is recommended to use a transformer just in case. This is because electronic equipment for Japan is designed to be used at 100V.