A cell culture device for inducing shear stress and on substrate strain on cells. In some embodiments, the device analyzes the captured information to determine whether the user is holding the device near the user’s right ear or left ear, and adjusts functionality of the device based at least in part upon how the user is likely holding the phone. The first module includes a first outer shell and a first printed circuit board within the first outer shell. A second presenter is assigned to the presenter slot of the first attendee group during a second conference portion. A method for fabricating the VCSEL structure is also provided. The client software has no knowledge of what the correct PIN should be and always generates a normal looking OTP based on whatever PIN is entered, and the only way to learn whether or not the OTP is correct is to submit it during user login.