Product Specifications: 3 highly effective training modes – sound, vibration, and adjustable static stimulation (1–16 levels) with removable contact points for vibration-only training | 3-channel remote control with safety lock allows control of up to 3 receivers simultaneously or individually, preventing accidental activation | 3300ft remote range provides reliable control for training in the yard, park, or on trails, ideal for recall and off-leash training.