The Luna Smart Bead is a kegel trainer with a difference; it contains smart technology that allows each user to create a workout routine based on their level of experience! As well as a memory function, which tracks your progress even during a battery change, it also has touch sensors which sense and respond to the contractions of your PC muscles. The Smart Bead is made from ABS plastic and coated in silky soft, silicone. It measures 4in or 10cm in circumference at its largest point and 3.25in or 8cm in total length. The Smart Bead requires one AAA battery and is waterproof up to one metre. The first time you use the Luna Smart Bead, it will be set on level three. You can keep track of what program you are on by checking how many times the LED light, beside the operating button, flashes when you turn it on. One flash indicates level one and so on, up to a maximum of five levels/flashes. Depending on your level of experience, the bead will move you up or down through the five settings. Each workout session lasts for about five minutes. You have approximately thirty seconds from the time you turn it on to insert the Smart Bead and get comfortable. You will feel three quick pulses of vibration which indicate the routine is about to start; they also signal the end of the session. When the routine starts, the Smart Bead will begin to emit pulses of vibration, squeeze your PC muscles when you feel the vibrations, hold that squeeze as the bead continues to vibrate and relax your PC muscles when the vibration stops. For those who desire a little pleasure before or after their workout, simply press and hold the operating button for approximately 3 seconds. This will turn on the constant vibration mode, allowing you to use the bead for clitoral or g-spot stimulation.