We have water-proofed the finger button! The FT-330 Finger Trainer Educator® 1/2 mile remote e-collar has all of the features found in the ET-300 Mini Educator® with the addition of a wireless button that can be programmed to either S button or the T button. The small 2.4-ounce receiver provides plenty of stimulation for large and small dogs. Alternate stimulation options include tone and vibration remote training.