Used once. Works perfectly—I’m just not a consistent user of devices like this, so their benefits are wasted on me. I bought it directly from Sephora, and it comes with two conductor gels, a brush, and a charger. I never used the conductor gels that came with the device—I used the gel in the bottle that’s also pictured here, which I bought intending to use it with a different device, so I used it once with that device and once with this one. This bottle is included with the purchase of the device.