Without external power source, Internal battery can ensure the time displays normally.
内置后配电池，保证无外接电源时，时间可常运转。
Motion and speed are sensed without mechanical couplings, bearings, linkages or an external power source.
运动和速度感到无机械轴承，联系或外部电源。
Motion and speed are sensed without mechanical couplings, bearings, linkages or an external power source.
运动和速度感到无机械轴承，联系或外部电源。
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