Model: PD518 1. Extremely easy to operate, 4 buttons correspond to 4 training modes. You can hide the remote control behind your back and train your dog blindly with one hand. 2. 2. The static shock adjustment knob is tactile and clearly differentiates between the 9 levels, making it easy to find the precise level of stimulation. 3. The buttons have an excellent tactile response that provides a satisfying "click" and no mishandling when pressed. 4. This product is durable and maintains good quality even after long time use. 5. Stable performance with real-time signal feedback. Translated with DeepL (free version)