a sensor comprising a first light source configured to transmit a first transmitting light having a first wavelength, a second light source configured to transmit a second transmitting light having a second wavelength; and a photo-detecting unit configured to absorb a first incident light having the first wavelength to generate a first detecting signal and a second incident light having the second wavelength to generate a second detecting signal;

a calculation circuit coupled to the sensor to output a calculating result in response to the first detecting signal and the second detecting signal, wherein the calculation circuit is configured to:

perform a pre-calculation on the first detecting signal and the second detecting signal to output a pre-calculation result;

perform a first analysis on the pre-calculation result to output a first signal;

perform a second analysis on the first detecting signal and the second detecting signal to output a second signal; and

predict the calculating result according to the first signal and the second signal; and

an adjustment circuit, coupled to the calculation circuit, configured to dynamically adjust a power mode associated with the sensing apparatus according to the calculating result,

wherein the calculating result comprises a material type of an object, a behavior of a user using the sensing apparatus, or a health data.