Flashing orange and blue indicator lights help guide your wrist to your heart level, making it easier to find the correct position.

闪烁的橘色和蓝色指示灯能指导你手腕处于心脏齐平为止，帮助您方便找准位置。

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For the latter, check out Orange Bike's Singing Guide Tour, where a local will sing you through the city's sites (not recommended for the easily embarrassed).

BBC: Amsterdam on wheels