The answer is: No and here’s why…
The emWave2 is equipped with a thumb sensor built in.
Even though the Finger Sensor has the same connector as an Ear Sensor, it requires more power than is available through the emWave2, therefore a computer USB connection is necessary to make it function.
NOTE: When the emWave2 device is plugged into the USB port of your computer and being used as an interface device with the emWave program, you may use a finger sensor plugged into the device, instead of the ear sensor.