This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
max property provides the maximum sensing distance the sensor is able to report, in centimeters.
var value = instanceOfDeviceProximityEvent.max;
A positive number indicating the maximum distance, in centimeters (cm), that the device's proximity sensor is able to detect and report.
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