Apple has defined the spots where the water indicators are located on their web page. iphone 6s are equipped with Liquid Contact Indicators in the base of the headphone jack. iphone 6s models will also have an indicator around the base in the dock-connector housing. These indicators are set off and flipped PINK the second they are available in immediate exposure to drinking water and even a liquid made up of water. The symptoms are specially made not to be set off by humidity and temperature adjustments.