A device for use with a smart phone or tablet, the device comprising: a measurement device including a light source comprising a plurality of light emitting diodes for measuring one or more physiological parameters, the measurement device configured to generate an input optical beam with one or more optical wavelengths, wherein at least a portion of the one or more optical wavelengths is a near-infrared wavelength 700 nanometres to 2500 nanometres； the measurement device comprising one or more lenses configured to receive and to deliver a portion of the input optical beam to a sample, wherein the sample reflects at least a portion of the input optical beam delivered to the sample； the measurement device further comprising a receiver to receive at least a portion of the input optical beam reflected from the sample； the light source configured to increase a signal-to-noise ratio of the input optical beam reflected from the sample, wherein the increased signal-to-noise ratio results from an increase to the light intensity from at least one of the plurality of light emitting diodes and from modulation of at least one of the plurality of light emitting diodes； the measurement device configured to generate an output signal； and wherein the modulation of at least one of the plurality of light emitting diodes has a modulation frequency, and wherein the receiver is configured to detect at the same frequency as the modulation of the at least one of the plurality of light emitting diodes.
