Without making direct contact, SONA 2's sonic waves offer fast yet gentle clitoral stimulation for mind-blowing pleasure. Compared to the original bestseller, SONA 2 has softer, deeper and an overall bigger mouth for complete satisfaction - both inside and out. Medical grade silicone hasn't changed, but upgraded so that's extra soft to the touch. SONA 2 is rechargeable and 100% waterproof. SONA 2 has 12 powerful yet gentile enough settings so every user can find the perfect pace. The second change, which came for more convenient use, is the way SONA 2 turns off. Instead of pushing and holding ( - ) on the control board, the middle button ( ) acts as setting changer and off button.