The coil: Change of wire and or number of windings will affect the electrical impedance. For the low frequencies, the DC-resistance will dominate but at higher frequencies, the inductance of the coil will dominate. This means that the balance between low and high frequencies is adjustable within some limits. The vibrator needs current to vibrate, so lower impedance means higher vibration force level (VFL). A battery-driven device will therefore be limited in performance by the available current.

The moving mass: The BEST vibrator is a recoil device, meaning that the moving part of the generator will cause a recoil force on the housing making it vibrate. The mass of the moving part has direct influence on the low-lying main resonance peak and the frequency response in the region. The mass also has direct influence on the maximum VFL for low frequencies. Additional mass element adjust these properties. For a given vibrational level of force, the internal movement of the vibrator unit reduces when adding extra mass. Therefore, extra mass will also reduce distortion and the possibility for mechanical overload.

The spring: The spring force holding the moving mass into place and giving the main resonance peak is made out of two counteracting components namely the two blade springs plus the stationary magnetic field. The balance between these components is very critical in order to achieve the correct compliance and having a stable system

The magnets: Not only will the magnets affect the resonance behavior and the stability of the system, but they will also have a direct influence on the sensitivity of the vibrator. This means that a stronger magnetic field will give more VFL for a given current level.

The housing: Design of the housing can provide an extra resonance peak in the high frequency region thus raising the force level.